diff --git a/pyproject.toml b/pyproject.toml
index 0b01271..72fb8fb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,14 +12,12 @@ dependencies = [
   "uvicorn>=0.30",
   "sqlalchemy>=2.0",
   "passlib[bcrypt]>=1.7",
-  "python-jose[cryptography]>=3.3"
+  "python-jose[cryptography]>=3.3",
+  "pyyaml>=6.0.2"
 ]
 
 [project.scripts]
 didactopus-api = "didactopus.api:main"
-didactopus-export-svg = "didactopus.export_svg:main"
-didactopus-render-bundle = "didactopus.render_bundle:main"
-didactopus-export-knowledge = "didactopus.knowledge_export:main"
 
 [tool.setuptools.packages.find]
 where = ["src"]
diff --git a/src/didactopus/api.py b/src/didactopus/api.py
index 3699cfd..4c88633 100644
--- a/src/didactopus/api.py
+++ b/src/didactopus/api.py
@@ -1,26 +1,27 @@
 from __future__ import annotations
-from fastapi import FastAPI, HTTPException, Header, Depends, BackgroundTasks
+from fastapi import FastAPI, HTTPException, Header, Depends
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.responses import FileResponse
 import uvicorn
-from datetime import datetime, timedelta, timezone
-from pathlib import Path
 from .db import Base, engine
-from .models import LoginRequest, RefreshRequest, TokenPair, CreateLearnerRequest, LearnerState, MediaRenderRequest, ArtifactRetentionUpdate, KnowledgeExportRequest
+from .models import (
+    LoginRequest, TokenPair, KnowledgeCandidateCreate, PromoteRequest,
+    SynthesisRunRequest, SynthesisPromoteRequest, CreateLearnerRequest,
+    ObjectEditRequest, PatchApplyRequest
+)
 from .repository import (
-    authenticate_user, get_user_by_id, store_refresh_token, refresh_token_active, revoke_refresh_token,
-    list_packs_for_user, get_pack, get_pack_row, create_learner, learner_owned_by_user, load_learner_state, save_learner_state,
-    create_render_job, list_render_jobs, list_artifacts, get_artifact, update_artifact_retention, soft_delete_artifact
+    authenticate_user, get_user_by_id, create_learner, create_candidate, list_candidates, get_candidate,
+    create_promotion, list_promotions, list_pack_patches, list_curriculum_drafts, list_skill_bundles,
+    list_synthesis_candidates, get_synthesis_candidate,
+    edit_pack_patch, edit_curriculum_draft, edit_skill_bundle, list_versions,
+    apply_pack_patch, export_curriculum_draft, export_skill_bundle
 )
 from .auth import issue_access_token, issue_refresh_token, decode_token, new_token_id
-from .engine import build_graph_frames, stable_layout
-from .worker import process_render_job
-from .knowledge_export import build_knowledge_snapshot
+from .synthesis import generate_synthesis_candidates
 
 Base.metadata.create_all(bind=engine)
-
-app = FastAPI(title="Didactopus API Prototype")
+app = FastAPI(title="Didactopus Object Versioning and Export API")
 app.add_middleware(CORSMiddleware, allow_origins=["*"], allow_credentials=True, allow_methods=["*"], allow_headers=["*"])
+_refresh_tokens = {}
 
 def current_user(authorization: str = Header(default="")):
     token = authorization.removeprefix("Bearer ").strip()
@@ -32,164 +33,118 @@ def current_user(authorization: str = Header(default="")):
         raise HTTPException(status_code=401, detail="Unauthorized")
     return user
 
-def ensure_learner_access(user, learner_id: str):
-    if user.role == "admin":
-        return
-    if not learner_owned_by_user(user.id, learner_id):
-        raise HTTPException(status_code=403, detail="Learner not accessible by this user")
-
-def ensure_pack_access(user, pack_id: str):
-    row = get_pack_row(pack_id)
-    if row is None:
-        raise HTTPException(status_code=404, detail="Pack not found")
-    if user.role == "admin":
-        return row
-    if row.policy_lane == "community":
-        return row
-    if row.owner_user_id == user.id:
-        return row
-    raise HTTPException(status_code=403, detail="Pack not accessible by this user")
-
-def future_iso(days: int) -> str:
-    return (datetime.now(timezone.utc) + timedelta(days=days)).isoformat()
+def require_reviewer(user = Depends(current_user)):
+    if user.role not in {"admin", "reviewer"}:
+        raise HTTPException(status_code=403, detail="Reviewer role required")
+    return user
 
 @app.post("/api/login", response_model=TokenPair)
 def login(payload: LoginRequest):
     user = authenticate_user(payload.username, payload.password)
-    if user is None:
-        raise HTTPException(status_code=401, detail="Invalid credentials")
-    token_id = new_token_id()
-    store_refresh_token(user.id, token_id)
-    return TokenPair(access_token=issue_access_token(user.id, user.username, user.role), refresh_token=issue_refresh_token(user.id, user.username, user.role, token_id), username=user.username, role=user.role)
-
-@app.post("/api/refresh", response_model=TokenPair)
-def refresh(payload: RefreshRequest):
-    data = decode_token(payload.refresh_token)
-    if not data or data.get("kind") != "refresh":
-        raise HTTPException(status_code=401, detail="Invalid refresh token")
-    token_id = data.get("jti")
-    if not token_id or not refresh_token_active(token_id):
-        raise HTTPException(status_code=401, detail="Refresh token inactive")
-    user = get_user_by_id(int(data["sub"]))
-    if user is None:
-        raise HTTPException(status_code=401, detail="User not found")
-    revoke_refresh_token(token_id)
-    new_jti = new_token_id()
-    store_refresh_token(user.id, new_jti)
-    return TokenPair(access_token=issue_access_token(user.id, user.username, user.role), refresh_token=issue_refresh_token(user.id, user.username, user.role, new_jti), username=user.username, role=user.role)
-
-@app.get("/api/packs")
-def api_list_packs(user = Depends(current_user)):
-    return [p.model_dump() for p in list_packs_for_user(user.id, include_unpublished=(user.role == "admin"))]
+    if user is None: raise HTTPException(status_code=401, detail="Invalid credentials")
+    token_id = new_token_id(); _refresh_tokens[token_id] = user.id
+    return TokenPair(access_token=issue_access_token(user.id, user.username, user.role),
+                     refresh_token=issue_refresh_token(user.id, user.username, user.role, token_id),
+                     username=user.username, role=user.role)
 
 @app.post("/api/learners")
 def api_create_learner(payload: CreateLearnerRequest, user = Depends(current_user)):
     create_learner(user.id, payload.learner_id, payload.display_name)
     return {"ok": True, "learner_id": payload.learner_id}
 
-@app.get("/api/learners/{learner_id}/state")
-def api_get_learner_state(learner_id: str, user = Depends(current_user)):
-    ensure_learner_access(user, learner_id)
-    return load_learner_state(learner_id).model_dump()
+@app.post("/api/knowledge-candidates")
+def api_create_candidate(payload: KnowledgeCandidateCreate, reviewer = Depends(require_reviewer)):
+    return {"candidate_id": create_candidate(payload)}
 
-@app.put("/api/learners/{learner_id}/state")
-def api_put_learner_state(learner_id: str, state: LearnerState, user = Depends(current_user)):
-    ensure_learner_access(user, learner_id)
-    if learner_id != state.learner_id:
-        raise HTTPException(status_code=400, detail="Learner ID mismatch")
-    return save_learner_state(state).model_dump()
+@app.get("/api/knowledge-candidates")
+def api_list_candidates(reviewer = Depends(require_reviewer)):
+    return list_candidates()
 
-@app.get("/api/packs/{pack_id}/layout")
-def api_pack_layout(pack_id: str, user = Depends(current_user)):
-    ensure_pack_access(user, pack_id)
-    pack = get_pack(pack_id)
-    return {"pack_id": pack_id, "layout": stable_layout(pack)} if pack else {"pack_id": pack_id, "layout": {}}
+@app.post("/api/knowledge-candidates/{candidate_id}/promote")
+def api_promote_candidate(candidate_id: int, payload: PromoteRequest, reviewer = Depends(require_reviewer)):
+    if get_candidate(candidate_id) is None: raise HTTPException(status_code=404, detail="Candidate not found")
+    return {"promotion_id": create_promotion(candidate_id, reviewer.id, payload)}
 
-@app.get("/api/learners/{learner_id}/graph-animation/{pack_id}")
-def api_graph_animation(learner_id: str, pack_id: str, user = Depends(current_user)):
-    ensure_learner_access(user, learner_id)
-    ensure_pack_access(user, pack_id)
-    pack = get_pack(pack_id)
-    state = load_learner_state(learner_id)
-    frames = build_graph_frames(state, pack)
-    return {
-        "learner_id": learner_id,
-        "pack_id": pack_id,
-        "pack_title": pack.title if pack else "",
-        "frames": frames,
-        "concepts": [{"id": c.id, "title": c.title, "prerequisites": c.prerequisites, "cross_pack_links": [l.model_dump() for l in c.cross_pack_links]} for c in pack.concepts] if pack else [],
-    }
+@app.get("/api/promotions")
+def api_list_promotions(reviewer = Depends(require_reviewer)):
+    return list_promotions()
 
-@app.post("/api/learners/{learner_id}/render-jobs/{pack_id}")
-def api_render_job(learner_id: str, pack_id: str, payload: MediaRenderRequest, background_tasks: BackgroundTasks, user = Depends(current_user)):
-    ensure_learner_access(user, learner_id)
-    ensure_pack_access(user, pack_id)
-    pack = get_pack(pack_id)
-    state = load_learner_state(learner_id)
-    animation = {
-        "learner_id": learner_id,
-        "pack_id": pack_id,
-        "pack_title": pack.title if pack else "",
-        "frames": build_graph_frames(state, pack),
-    }
-    job_id = create_render_job(learner_id, pack_id, payload.format, payload.fps, payload.theme)
-    background_tasks.add_task(process_render_job, job_id, learner_id, pack_id, payload.format, payload.fps, payload.theme, payload.retention_class, payload.retention_days, animation)
-    return {"job_id": job_id, "status": "queued"}
+@app.get("/api/pack-patches")
+def api_list_pack_patches(reviewer = Depends(require_reviewer)):
+    return list_pack_patches()
 
-@app.get("/api/render-jobs")
-def api_list_render_jobs(learner_id: str | None = None, user = Depends(current_user)):
-    if learner_id:
-        ensure_learner_access(user, learner_id)
-    return list_render_jobs(learner_id)
+@app.get("/api/curriculum-drafts")
+def api_list_curriculum_drafts(reviewer = Depends(require_reviewer)):
+    return list_curriculum_drafts()
 
-@app.get("/api/artifacts")
-def api_list_artifacts(learner_id: str | None = None, user = Depends(current_user)):
-    if learner_id:
-        ensure_learner_access(user, learner_id)
-    return list_artifacts(learner_id)
+@app.get("/api/skill-bundles")
+def api_list_skill_bundles(reviewer = Depends(require_reviewer)):
+    return list_skill_bundles()
 
-@app.get("/api/artifacts/{artifact_id}/download")
-def api_download_artifact(artifact_id: int, user = Depends(current_user)):
-    artifact = get_artifact(artifact_id)
-    if artifact is None or artifact.is_deleted:
-        raise HTTPException(status_code=404, detail="Artifact not found")
-    ensure_learner_access(user, artifact.learner_id)
-    path = Path(artifact.path)
-    if not path.exists():
-        raise HTTPException(status_code=404, detail="Artifact path missing")
-    if path.is_dir():
-        manifest = path / "render_manifest.json"
-        if not manifest.exists():
-            raise HTTPException(status_code=404, detail="Artifact manifest missing")
-        return FileResponse(str(manifest), filename=f"artifact-{artifact_id}-manifest.json")
-    return FileResponse(str(path), filename=path.name)
+@app.post("/api/pack-patches/{patch_id}/edit")
+def api_edit_patch(patch_id: int, payload: ObjectEditRequest, reviewer = Depends(require_reviewer)):
+    row = edit_pack_patch(patch_id, payload.payload, reviewer.id, payload.note)
+    if row is None: raise HTTPException(status_code=404, detail="Patch not found")
+    return {"patch_id": row.id, "current_version": row.current_version}
 
-@app.post("/api/artifacts/{artifact_id}/retention")
-def api_update_artifact_retention(artifact_id: int, payload: ArtifactRetentionUpdate, user = Depends(current_user)):
-    artifact = get_artifact(artifact_id)
-    if artifact is None or artifact.is_deleted:
-        raise HTTPException(status_code=404, detail="Artifact not found")
-    ensure_learner_access(user, artifact.learner_id)
-    expires_at = "" if payload.retention_days is None else future_iso(payload.retention_days)
-    updated = update_artifact_retention(artifact_id, payload.retention_class, expires_at)
-    return {"artifact_id": updated.id, "retention_class": updated.retention_class, "expires_at": updated.expires_at}
+@app.post("/api/curriculum-drafts/{draft_id}/edit")
+def api_edit_curriculum(draft_id: int, payload: ObjectEditRequest, reviewer = Depends(require_reviewer)):
+    row = edit_curriculum_draft(draft_id, payload.payload, reviewer.id, payload.note)
+    if row is None: raise HTTPException(status_code=404, detail="Draft not found")
+    return {"draft_id": row.id, "current_version": row.current_version}
 
-@app.delete("/api/artifacts/{artifact_id}")
-def api_delete_artifact(artifact_id: int, user = Depends(current_user)):
-    artifact = get_artifact(artifact_id)
-    if artifact is None or artifact.is_deleted:
-        raise HTTPException(status_code=404, detail="Artifact not found")
-    ensure_learner_access(user, artifact.learner_id)
-    updated = soft_delete_artifact(artifact_id)
-    return {"artifact_id": updated.id, "is_deleted": updated.is_deleted}
+@app.post("/api/skill-bundles/{bundle_id}/edit")
+def api_edit_skill(bundle_id: int, payload: ObjectEditRequest, reviewer = Depends(require_reviewer)):
+    row = edit_skill_bundle(bundle_id, payload.payload, reviewer.id, payload.note)
+    if row is None: raise HTTPException(status_code=404, detail="Skill bundle not found")
+    return {"skill_bundle_id": row.id, "current_version": row.current_version}
 
-@app.post("/api/learners/{learner_id}/knowledge-export/{pack_id}")
-def api_knowledge_export(learner_id: str, pack_id: str, payload: KnowledgeExportRequest, user = Depends(current_user)):
-    ensure_learner_access(user, learner_id)
-    ensure_pack_access(user, pack_id)
-    snapshot = build_knowledge_snapshot(learner_id, pack_id)
-    snapshot["requested_export_kind"] = payload.export_kind
-    return snapshot
+@app.get("/api/object-versions/{object_kind}/{object_id}")
+def api_object_versions(object_kind: str, object_id: int, reviewer = Depends(require_reviewer)):
+    return list_versions(object_kind, object_id)
+
+@app.post("/api/pack-patches/{patch_id}/apply")
+def api_apply_patch(patch_id: int, payload: PatchApplyRequest, reviewer = Depends(require_reviewer)):
+    row = apply_pack_patch(patch_id, reviewer.id, payload.note)
+    if row is None: raise HTTPException(status_code=404, detail="Patch or pack not found")
+    return {"patch_id": row.id, "status": row.status}
+
+@app.get("/api/curriculum-drafts/{draft_id}/export")
+def api_export_curriculum(draft_id: int, reviewer = Depends(require_reviewer)):
+    out = export_curriculum_draft(draft_id)
+    if out is None: raise HTTPException(status_code=404, detail="Draft not found")
+    return out
+
+@app.get("/api/skill-bundles/{bundle_id}/export")
+def api_export_skill(bundle_id: int, reviewer = Depends(require_reviewer)):
+    out = export_skill_bundle(bundle_id)
+    if out is None: raise HTTPException(status_code=404, detail="Skill bundle not found")
+    return out
+
+@app.post("/api/synthesis/run")
+def api_run_synthesis(payload: SynthesisRunRequest, reviewer = Depends(require_reviewer)):
+    created = generate_synthesis_candidates(payload.source_pack_id, payload.target_pack_id, payload.limit)
+    return {"created_count": len(created), "synthesis_ids": created}
+
+@app.get("/api/synthesis/candidates")
+def api_list_synthesis(reviewer = Depends(require_reviewer)):
+    return list_synthesis_candidates()
+
+@app.post("/api/synthesis/candidates/{synthesis_id}/promote")
+def api_promote_synthesis(synthesis_id: int, payload: SynthesisPromoteRequest, reviewer = Depends(require_reviewer)):
+    syn = get_synthesis_candidate(synthesis_id)
+    if syn is None: raise HTTPException(status_code=404, detail="Synthesis candidate not found")
+    candidate_id = create_candidate(KnowledgeCandidateCreate(
+        source_type="synthesis_engine", learner_id="system", pack_id=syn["source_pack_id"],
+        candidate_kind="synthesis_proposal",
+        title=f"Synthesis: {syn['source_concept_id']} ↔ {syn['target_concept_id']}",
+        summary=syn["explanation"], structured_payload=syn,
+        evidence_summary="Promoted from synthesis engine candidate",
+        confidence_hint=syn["score_total"], novelty_score=syn["evidence"].get("novelty", 0.0),
+        synthesis_score=syn["score_total"], triage_lane=payload.promotion_target,
+    ))
+    promotion_id = create_promotion(candidate_id, reviewer.id, PromoteRequest(promotion_target=payload.promotion_target, target_object_id="", promotion_status="approved"))
+    return {"candidate_id": candidate_id, "promotion_id": promotion_id}
 
 def main():
     uvicorn.run(app, host="127.0.0.1", port=8011)
diff --git a/src/didactopus/models.py b/src/didactopus/models.py
index 8840b5e..31f415f 100644
--- a/src/didactopus/models.py
+++ b/src/didactopus/models.py
@@ -1,6 +1,10 @@
 from __future__ import annotations
 from pydantic import BaseModel, Field
 
+class LoginRequest(BaseModel):
+    username: str
+    password: str
+
 class TokenPair(BaseModel):
     access_token: str
     refresh_token: str
@@ -8,81 +12,41 @@ class TokenPair(BaseModel):
     username: str
     role: str
 
-class LoginRequest(BaseModel):
-    username: str
-    password: str
-
-class RefreshRequest(BaseModel):
-    refresh_token: str
-
-class GraphPosition(BaseModel):
-    x: float
-    y: float
-
-class CrossPackLink(BaseModel):
-    source_concept_id: str
-    target_pack_id: str
-    target_concept_id: str
-    relationship: str = "related"
-
-class PackConcept(BaseModel):
-    id: str
+class KnowledgeCandidateCreate(BaseModel):
+    source_type: str = "learner_export"
+    source_artifact_id: int | None = None
+    learner_id: str
+    pack_id: str
+    candidate_kind: str
     title: str
-    prerequisites: list[str] = Field(default_factory=list)
-    masteryDimension: str = "mastery"
-    exerciseReward: str = ""
-    position: GraphPosition | None = None
-    cross_pack_links: list[CrossPackLink] = Field(default_factory=list)
+    summary: str = ""
+    structured_payload: dict = Field(default_factory=dict)
+    evidence_summary: str = ""
+    confidence_hint: float = 0.0
+    novelty_score: float = 0.0
+    synthesis_score: float = 0.0
+    triage_lane: str = "archive"
 
-class PackData(BaseModel):
-    id: str
-    title: str
-    subtitle: str = ""
-    level: str = "novice-friendly"
-    concepts: list[PackConcept] = Field(default_factory=list)
-    onboarding: dict = Field(default_factory=dict)
-    compliance: dict = Field(default_factory=dict)
+class PromoteRequest(BaseModel):
+    promotion_target: str
+    target_object_id: str = ""
+    promotion_status: str = "approved"
+
+class SynthesisRunRequest(BaseModel):
+    source_pack_id: str | None = None
+    target_pack_id: str | None = None
+    limit: int = 20
+
+class SynthesisPromoteRequest(BaseModel):
+    promotion_target: str = "pack_improvement"
+
+class ObjectEditRequest(BaseModel):
+    payload: dict = Field(default_factory=dict)
+    note: str = ""
+
+class PatchApplyRequest(BaseModel):
+    note: str = "Applied pack patch"
 
 class CreateLearnerRequest(BaseModel):
     learner_id: str
     display_name: str = ""
-
-class MasteryRecord(BaseModel):
-    concept_id: str
-    dimension: str
-    score: float = 0.0
-    confidence: float = 0.0
-    evidence_count: int = 0
-    last_updated: str = ""
-
-class EvidenceEvent(BaseModel):
-    concept_id: str
-    dimension: str
-    score: float
-    confidence_hint: float = 0.5
-    timestamp: str
-    kind: str = "exercise"
-    source_id: str = ""
-
-class LearnerState(BaseModel):
-    learner_id: str
-    records: list[MasteryRecord] = Field(default_factory=list)
-    history: list[EvidenceEvent] = Field(default_factory=list)
-
-class MediaRenderRequest(BaseModel):
-    learner_id: str
-    pack_id: str
-    format: str = "gif"
-    fps: int = 2
-    theme: str = "default"
-    retention_class: str = "standard"
-    retention_days: int = 30
-
-class ArtifactRetentionUpdate(BaseModel):
-    retention_class: str
-    retention_days: int | None = None
-
-class KnowledgeExportRequest(BaseModel):
-    learner_id: str
-    pack_id: str
-    export_kind: str = "knowledge_snapshot"
diff --git a/src/didactopus/orm.py b/src/didactopus/orm.py
index 300796e..4a39dd4 100644
--- a/src/didactopus/orm.py
+++ b/src/didactopus/orm.py
@@ -10,13 +10,6 @@ class UserORM(Base):
     role: Mapped[str] = mapped_column(String(50), default="learner")
     is_active: Mapped[bool] = mapped_column(Boolean, default=True)
 
-class RefreshTokenORM(Base):
-    __tablename__ = "refresh_tokens"
-    id: Mapped[int] = mapped_column(Integer, primary_key=True)
-    user_id: Mapped[int] = mapped_column(ForeignKey("users.id"), index=True)
-    token_id: Mapped[str] = mapped_column(String(255), unique=True, index=True)
-    is_revoked: Mapped[bool] = mapped_column(Boolean, default=False)
-
 class PackORM(Base):
     __tablename__ = "packs"
     id: Mapped[str] = mapped_column(String(100), primary_key=True)
@@ -28,61 +21,85 @@ class PackORM(Base):
     data_json: Mapped[str] = mapped_column(Text)
     is_published: Mapped[bool] = mapped_column(Boolean, default=False)
 
-class LearnerORM(Base):
-    __tablename__ = "learners"
-    id: Mapped[str] = mapped_column(String(100), primary_key=True)
-    owner_user_id: Mapped[int] = mapped_column(ForeignKey("users.id"), index=True)
-    display_name: Mapped[str] = mapped_column(String(255), default="")
-
-class MasteryRecordORM(Base):
-    __tablename__ = "mastery_records"
-    id: Mapped[int] = mapped_column(Integer, primary_key=True)
-    learner_id: Mapped[str] = mapped_column(ForeignKey("learners.id"), index=True)
-    concept_id: Mapped[str] = mapped_column(String(100), index=True)
-    dimension: Mapped[str] = mapped_column(String(100), default="mastery")
-    score: Mapped[float] = mapped_column(Float, default=0.0)
-    confidence: Mapped[float] = mapped_column(Float, default=0.0)
-    evidence_count: Mapped[int] = mapped_column(Integer, default=0)
-    last_updated: Mapped[str] = mapped_column(String(100), default="")
-
-class EvidenceEventORM(Base):
-    __tablename__ = "evidence_events"
-    id: Mapped[int] = mapped_column(Integer, primary_key=True)
-    learner_id: Mapped[str] = mapped_column(ForeignKey("learners.id"), index=True)
-    concept_id: Mapped[str] = mapped_column(String(100), index=True)
-    dimension: Mapped[str] = mapped_column(String(100), default="mastery")
-    score: Mapped[float] = mapped_column(Float, default=0.0)
-    confidence_hint: Mapped[float] = mapped_column(Float, default=0.5)
-    timestamp: Mapped[str] = mapped_column(String(100), default="")
-    kind: Mapped[str] = mapped_column(String(50), default="exercise")
-    source_id: Mapped[str] = mapped_column(String(255), default="")
-
-class RenderJobORM(Base):
-    __tablename__ = "render_jobs"
+class KnowledgeCandidateORM(Base):
+    __tablename__ = "knowledge_candidates"
     id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    source_type: Mapped[str] = mapped_column(String(50), default="learner_export")
+    source_artifact_id: Mapped[int | None] = mapped_column(Integer, nullable=True)
     learner_id: Mapped[str] = mapped_column(String(100), index=True)
     pack_id: Mapped[str] = mapped_column(String(100), index=True)
-    requested_format: Mapped[str] = mapped_column(String(20), default="gif")
-    fps: Mapped[int] = mapped_column(Integer, default=2)
-    theme: Mapped[str] = mapped_column(String(100), default="default")
-    status: Mapped[str] = mapped_column(String(50), default="queued")
-    bundle_dir: Mapped[str] = mapped_column(Text, default="")
-    payload_json: Mapped[str] = mapped_column(Text, default="")
-    manifest_path: Mapped[str] = mapped_column(Text, default="")
-    script_path: Mapped[str] = mapped_column(Text, default="")
-    error_text: Mapped[str] = mapped_column(Text, default="")
+    candidate_kind: Mapped[str] = mapped_column(String(100), index=True)
+    title: Mapped[str] = mapped_column(String(255))
+    summary: Mapped[str] = mapped_column(Text, default="")
+    structured_payload_json: Mapped[str] = mapped_column(Text, default="{}")
+    evidence_summary: Mapped[str] = mapped_column(Text, default="")
+    confidence_hint: Mapped[float] = mapped_column(Float, default=0.0)
+    novelty_score: Mapped[float] = mapped_column(Float, default=0.0)
+    synthesis_score: Mapped[float] = mapped_column(Float, default=0.0)
+    triage_lane: Mapped[str] = mapped_column(String(50), default="archive")
+    current_status: Mapped[str] = mapped_column(String(50), default="captured")
+    created_at: Mapped[str] = mapped_column(String(100), default="")
 
-class ArtifactORM(Base):
-    __tablename__ = "artifacts"
+class PromotionRecordORM(Base):
+    __tablename__ = "promotion_records"
     id: Mapped[int] = mapped_column(Integer, primary_key=True)
-    render_job_id: Mapped[int] = mapped_column(ForeignKey("render_jobs.id"), index=True)
-    learner_id: Mapped[str] = mapped_column(String(100), index=True)
+    candidate_id: Mapped[int] = mapped_column(ForeignKey("knowledge_candidates.id"), index=True)
+    promotion_target: Mapped[str] = mapped_column(String(50), index=True)
+    target_object_id: Mapped[str] = mapped_column(String(100), default="")
+    promotion_status: Mapped[str] = mapped_column(String(50), default="draft")
+    promoted_by: Mapped[int] = mapped_column(ForeignKey("users.id"), index=True)
+    created_at: Mapped[str] = mapped_column(String(100), default="")
+
+class PackPatchProposalORM(Base):
+    __tablename__ = "pack_patch_proposals"
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    candidate_id: Mapped[int] = mapped_column(ForeignKey("knowledge_candidates.id"), index=True)
     pack_id: Mapped[str] = mapped_column(String(100), index=True)
-    artifact_type: Mapped[str] = mapped_column(String(50), default="render_bundle")
-    format: Mapped[str] = mapped_column(String(20), default="gif")
-    title: Mapped[str] = mapped_column(String(255), default="")
-    path: Mapped[str] = mapped_column(Text, default="")
-    metadata_json: Mapped[str] = mapped_column(Text, default="{}")
-    retention_class: Mapped[str] = mapped_column(String(50), default="standard")
-    expires_at: Mapped[str] = mapped_column(String(100), default="")
-    is_deleted: Mapped[bool] = mapped_column(Boolean, default=False)
+    patch_type: Mapped[str] = mapped_column(String(100), default="content_revision")
+    title: Mapped[str] = mapped_column(String(255))
+    proposed_change_json: Mapped[str] = mapped_column(Text, default="{}")
+    evidence_summary: Mapped[str] = mapped_column(Text, default="")
+    reviewer_notes: Mapped[str] = mapped_column(Text, default="")
+    status: Mapped[str] = mapped_column(String(50), default="proposed")
+    current_version: Mapped[int] = mapped_column(Integer, default=1)
+    created_at: Mapped[str] = mapped_column(String(100), default="")
+
+class CurriculumDraftORM(Base):
+    __tablename__ = "curriculum_drafts"
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    candidate_id: Mapped[int] = mapped_column(ForeignKey("knowledge_candidates.id"), index=True)
+    topic_focus: Mapped[str] = mapped_column(String(255), default="")
+    product_type: Mapped[str] = mapped_column(String(100), default="lesson_outline")
+    audience: Mapped[str] = mapped_column(String(100), default="general")
+    source_concepts_json: Mapped[str] = mapped_column(Text, default="[]")
+    content_markdown: Mapped[str] = mapped_column(Text, default="")
+    editorial_notes: Mapped[str] = mapped_column(Text, default="")
+    status: Mapped[str] = mapped_column(String(50), default="draft")
+    current_version: Mapped[int] = mapped_column(Integer, default=1)
+    created_at: Mapped[str] = mapped_column(String(100), default="")
+
+class SkillBundleORM(Base):
+    __tablename__ = "skill_bundles"
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    candidate_id: Mapped[int] = mapped_column(ForeignKey("knowledge_candidates.id"), index=True)
+    skill_name: Mapped[str] = mapped_column(String(255))
+    domain: Mapped[str] = mapped_column(String(100), default="")
+    prerequisites_json: Mapped[str] = mapped_column(Text, default="[]")
+    expected_inputs_json: Mapped[str] = mapped_column(Text, default="[]")
+    failure_modes_json: Mapped[str] = mapped_column(Text, default="[]")
+    validation_checks_json: Mapped[str] = mapped_column(Text, default="[]")
+    canonical_examples_json: Mapped[str] = mapped_column(Text, default="[]")
+    status: Mapped[str] = mapped_column(String(50), default="draft")
+    current_version: Mapped[int] = mapped_column(Integer, default=1)
+    created_at: Mapped[str] = mapped_column(String(100), default="")
+
+class ObjectVersionORM(Base):
+    __tablename__ = "object_versions"
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    object_kind: Mapped[str] = mapped_column(String(50), index=True)
+    object_id: Mapped[int] = mapped_column(Integer, index=True)
+    version_number: Mapped[int] = mapped_column(Integer, default=1)
+    payload_json: Mapped[str] = mapped_column(Text, default="{}")
+    editor_id: Mapped[int] = mapped_column(ForeignKey("users.id"), index=True)
+    note: Mapped[str] = mapped_column(Text, default="")
+    created_at: Mapped[str] = mapped_column(String(100), default="")
diff --git a/src/didactopus/repository.py b/src/didactopus/repository.py
index 4610a8c..cf2ba6f 100644
--- a/src/didactopus/repository.py
+++ b/src/didactopus/repository.py
@@ -1,11 +1,17 @@
 from __future__ import annotations
 import json
+from datetime import datetime, timezone
 from sqlalchemy import select
 from .db import SessionLocal
-from .orm import UserORM, RefreshTokenORM, PackORM, LearnerORM, MasteryRecordORM, EvidenceEventORM, RenderJobORM, ArtifactORM
-from .models import PackData, LearnerState, MasteryRecord, EvidenceEvent
+from .orm import (
+    UserORM, PackORM, LearnerORM, KnowledgeCandidateORM, PromotionRecordORM,
+    PackPatchProposalORM, CurriculumDraftORM, SkillBundleORM, ObjectVersionORM, SynthesisCandidateORM
+)
 from .auth import verify_password
 
+def now_iso() -> str:
+    return datetime.now(timezone.utc).isoformat()
+
 def get_user_by_username(username: str):
     with SessionLocal() as db:
         return db.execute(select(UserORM).where(UserORM.username == username)).scalar_one_or_none()
@@ -20,216 +26,474 @@ def authenticate_user(username: str, password: str):
         return None
     return user
 
-def store_refresh_token(user_id: int, token_id: str):
+def list_packs():
     with SessionLocal() as db:
-        db.add(RefreshTokenORM(user_id=user_id, token_id=token_id, is_revoked=False))
-        db.commit()
-
-def refresh_token_active(token_id: str) -> bool:
-    with SessionLocal() as db:
-        row = db.execute(select(RefreshTokenORM).where(RefreshTokenORM.token_id == token_id)).scalar_one_or_none()
-        return row is not None and not row.is_revoked
-
-def revoke_refresh_token(token_id: str):
-    with SessionLocal() as db:
-        row = db.execute(select(RefreshTokenORM).where(RefreshTokenORM.token_id == token_id)).scalar_one_or_none()
-        if row:
-            row.is_revoked = True
-            db.commit()
-
-def list_packs_for_user(user_id: int | None = None, include_unpublished: bool = False):
-    with SessionLocal() as db:
-        stmt = select(PackORM)
-        if not include_unpublished:
-            stmt = stmt.where(PackORM.is_published == True)
-        rows = db.execute(stmt).scalars().all()
-        out = []
-        for r in rows:
-            if r.policy_lane == "community":
-                out.append(PackData.model_validate(json.loads(r.data_json)))
-            elif user_id is not None and r.owner_user_id == user_id:
-                out.append(PackData.model_validate(json.loads(r.data_json)))
-        return out
+        return db.execute(select(PackORM).order_by(PackORM.id)).scalars().all()
 
 def get_pack(pack_id: str):
-    with SessionLocal() as db:
-        row = db.get(PackORM, pack_id)
-        return None if row is None else PackData.model_validate(json.loads(row.data_json))
-
-def get_pack_row(pack_id: str):
     with SessionLocal() as db:
         return db.get(PackORM, pack_id)
 
-def upsert_pack(pack: PackData, submitted_by_user_id: int, policy_lane: str = "personal", is_published: bool = False):
-    with SessionLocal() as db:
-        row = db.get(PackORM, pack.id)
-        payload = json.dumps(pack.model_dump())
-        if row is None:
-            row = PackORM(
-                id=pack.id,
-                owner_user_id=submitted_by_user_id if policy_lane == "personal" else None,
-                policy_lane=policy_lane,
-                title=pack.title,
-                subtitle=pack.subtitle,
-                level=pack.level,
-                data_json=payload,
-                is_published=is_published if policy_lane == "personal" else False,
-            )
-            db.add(row)
-        else:
-            row.owner_user_id = submitted_by_user_id if policy_lane == "personal" else row.owner_user_id
-            row.policy_lane = policy_lane
-            row.title = pack.title
-            row.subtitle = pack.subtitle
-            row.level = pack.level
-            row.data_json = payload
-            if policy_lane == "personal":
-                row.is_published = is_published
-        db.commit()
-
 def create_learner(owner_user_id: int, learner_id: str, display_name: str = ""):
     with SessionLocal() as db:
         if db.get(LearnerORM, learner_id) is None:
             db.add(LearnerORM(id=learner_id, owner_user_id=owner_user_id, display_name=display_name))
             db.commit()
 
-def learner_owned_by_user(user_id: int, learner_id: str) -> bool:
+def create_candidate(payload):
     with SessionLocal() as db:
-        learner = db.get(LearnerORM, learner_id)
-        return learner is not None and learner.owner_user_id == user_id
-
-def load_learner_state(learner_id: str):
-    with SessionLocal() as db:
-        records = db.execute(select(MasteryRecordORM).where(MasteryRecordORM.learner_id == learner_id)).scalars().all()
-        history = db.execute(select(EvidenceEventORM).where(EvidenceEventORM.learner_id == learner_id)).scalars().all()
-        return LearnerState(
-            learner_id=learner_id,
-            records=[MasteryRecord(concept_id=r.concept_id, dimension=r.dimension, score=r.score, confidence=r.confidence, evidence_count=r.evidence_count, last_updated=r.last_updated) for r in records],
-            history=[EvidenceEvent(concept_id=h.concept_id, dimension=h.dimension, score=h.score, confidence_hint=h.confidence_hint, timestamp=h.timestamp, kind=h.kind, source_id=h.source_id) for h in history],
-        )
-
-def save_learner_state(state: LearnerState):
-    with SessionLocal() as db:
-        db.query(MasteryRecordORM).filter(MasteryRecordORM.learner_id == state.learner_id).delete()
-        db.query(EvidenceEventORM).filter(EvidenceEventORM.learner_id == state.learner_id).delete()
-        for r in state.records:
-            db.add(MasteryRecordORM(learner_id=state.learner_id, concept_id=r.concept_id, dimension=r.dimension, score=r.score, confidence=r.confidence, evidence_count=r.evidence_count, last_updated=r.last_updated))
-        for h in state.history:
-            db.add(EvidenceEventORM(learner_id=state.learner_id, concept_id=h.concept_id, dimension=h.dimension, score=h.score, confidence_hint=h.confidence_hint, timestamp=h.timestamp, kind=h.kind, source_id=h.source_id))
-        db.commit()
-    return state
-
-def create_render_job(learner_id: str, pack_id: str, requested_format: str, fps: int, theme: str):
-    with SessionLocal() as db:
-        row = RenderJobORM(
-            learner_id=learner_id,
-            pack_id=pack_id,
-            requested_format=requested_format,
-            fps=fps,
-            theme=theme,
-            status="queued",
+        row = KnowledgeCandidateORM(
+            source_type=payload.source_type,
+            source_artifact_id=payload.source_artifact_id,
+            learner_id=payload.learner_id,
+            pack_id=payload.pack_id,
+            candidate_kind=payload.candidate_kind,
+            title=payload.title,
+            summary=payload.summary,
+            structured_payload_json=json.dumps(payload.structured_payload),
+            evidence_summary=payload.evidence_summary,
+            confidence_hint=payload.confidence_hint,
+            novelty_score=payload.novelty_score,
+            synthesis_score=payload.synthesis_score,
+            triage_lane=payload.triage_lane,
+            current_status="triaged",
+            created_at=now_iso(),
         )
         db.add(row)
         db.commit()
         db.refresh(row)
         return row.id
 
-def update_render_job(job_id: int, **fields):
+def list_candidates():
     with SessionLocal() as db:
-        row = db.get(RenderJobORM, job_id)
-        if row is None:
-            return None
-        for k, v in fields.items():
-            setattr(row, k, v)
-        db.commit()
-        db.refresh(row)
-        return row
-
-def list_render_jobs(learner_id: str | None = None):
-    with SessionLocal() as db:
-        stmt = select(RenderJobORM).order_by(RenderJobORM.id.desc())
-        if learner_id:
-            stmt = stmt.where(RenderJobORM.learner_id == learner_id)
-        rows = db.execute(stmt).scalars().all()
+        rows = db.execute(select(KnowledgeCandidateORM).order_by(KnowledgeCandidateORM.id.desc())).scalars().all()
         return [{
-            "job_id": r.id,
-            "learner_id": r.learner_id,
+            "candidate_id": r.id,
             "pack_id": r.pack_id,
-            "requested_format": r.requested_format,
-            "fps": r.fps,
-            "theme": r.theme,
-            "status": r.status,
-            "bundle_dir": r.bundle_dir,
-            "payload_json": r.payload_json,
-            "manifest_path": r.manifest_path,
-            "script_path": r.script_path,
-            "error_text": r.error_text,
-        } for r in rows]
-
-def register_artifact(render_job_id: int, learner_id: str, pack_id: str, artifact_type: str, fmt: str, title: str, path: str, metadata: dict, retention_class: str = "standard", expires_at: str = ""):
-    with SessionLocal() as db:
-        row = ArtifactORM(
-            render_job_id=render_job_id,
-            learner_id=learner_id,
-            pack_id=pack_id,
-            artifact_type=artifact_type,
-            format=fmt,
-            title=title,
-            path=path,
-            metadata_json=json.dumps(metadata),
-            retention_class=retention_class,
-            expires_at=expires_at,
-            is_deleted=False,
-        )
-        db.add(row)
-        db.commit()
-        db.refresh(row)
-        return row.id
-
-def list_artifacts(learner_id: str | None = None, include_deleted: bool = False):
-    with SessionLocal() as db:
-        stmt = select(ArtifactORM).order_by(ArtifactORM.id.desc())
-        if learner_id:
-            stmt = stmt.where(ArtifactORM.learner_id == learner_id)
-        if not include_deleted:
-            stmt = stmt.where(ArtifactORM.is_deleted == False)
-        rows = db.execute(stmt).scalars().all()
-        return [{
-            "artifact_id": r.id,
-            "render_job_id": r.render_job_id,
-            "learner_id": r.learner_id,
-            "pack_id": r.pack_id,
-            "artifact_type": r.artifact_type,
-            "format": r.format,
+            "candidate_kind": r.candidate_kind,
             "title": r.title,
-            "path": r.path,
-            "retention_class": r.retention_class,
-            "expires_at": r.expires_at,
-            "is_deleted": r.is_deleted,
-            "metadata": json.loads(r.metadata_json or "{}"),
+            "summary": r.summary,
+            "structured_payload": json.loads(r.structured_payload_json or "{}"),
+            "evidence_summary": r.evidence_summary,
+            "confidence_hint": r.confidence_hint,
+            "novelty_score": r.novelty_score,
+            "synthesis_score": r.synthesis_score,
+            "triage_lane": r.triage_lane,
+            "current_status": r.current_status,
         } for r in rows]
 
-def get_artifact(artifact_id: int):
+def get_candidate(candidate_id: int):
     with SessionLocal() as db:
-        return db.get(ArtifactORM, artifact_id)
-
-def update_artifact_retention(artifact_id: int, retention_class: str, expires_at: str):
-    with SessionLocal() as db:
-        row = db.get(ArtifactORM, artifact_id)
-        if row is None:
+        r = db.get(KnowledgeCandidateORM, candidate_id)
+        if r is None:
             return None
-        row.retention_class = retention_class
-        row.expires_at = expires_at
+        return {
+            "candidate_id": r.id,
+            "pack_id": r.pack_id,
+            "candidate_kind": r.candidate_kind,
+            "title": r.title,
+            "summary": r.summary,
+            "structured_payload": json.loads(r.structured_payload_json or "{}"),
+            "evidence_summary": r.evidence_summary,
+            "confidence_hint": r.confidence_hint,
+            "novelty_score": r.novelty_score,
+            "synthesis_score": r.synthesis_score,
+            "triage_lane": r.triage_lane,
+            "current_status": r.current_status,
+        }
+
+def create_pack_patch(candidate):
+    with SessionLocal() as db:
+        row = PackPatchProposalORM(
+            candidate_id=candidate["candidate_id"],
+            pack_id=candidate["pack_id"],
+            patch_type=candidate["candidate_kind"],
+            title=candidate["title"],
+            proposed_change_json=json.dumps(candidate["structured_payload"]),
+            evidence_summary=candidate["evidence_summary"],
+            reviewer_notes="",
+            status="proposed",
+            current_version=1,
+            created_at=now_iso(),
+        )
+        db.add(row)
         db.commit()
         db.refresh(row)
-        return row
+        _create_version("pack_patch", row.id, 1, {
+            "title": row.title,
+            "proposed_change": json.loads(row.proposed_change_json or "{}"),
+            "status": row.status,
+            "reviewer_notes": row.reviewer_notes,
+        }, 1, "Initial version")
+        return f"patch:{row.id}"
 
-def soft_delete_artifact(artifact_id: int):
+def create_curriculum_draft(candidate):
     with SessionLocal() as db:
-        row = db.get(ArtifactORM, artifact_id)
-        if row is None:
-            return None
-        row.is_deleted = True
+        payload = candidate["structured_payload"]
+        source_concepts = payload.get("source_concepts", [payload.get("affected_concept")] if payload.get("affected_concept") else [])
+        content = f"# {candidate['title']}\n\n{candidate['summary']}\n\n## Evidence\n{candidate['evidence_summary']}\n"
+        row = CurriculumDraftORM(
+            candidate_id=candidate["candidate_id"],
+            topic_focus=candidate["title"],
+            product_type="lesson_outline",
+            audience="general",
+            source_concepts_json=json.dumps(source_concepts),
+            content_markdown=content,
+            editorial_notes="",
+            status="draft",
+            current_version=1,
+            created_at=now_iso(),
+        )
+        db.add(row)
         db.commit()
         db.refresh(row)
-        return row
+        _create_version("curriculum_draft", row.id, 1, {
+            "topic_focus": row.topic_focus,
+            "content_markdown": row.content_markdown,
+            "product_type": row.product_type,
+            "audience": row.audience,
+        }, 1, "Initial version")
+        return f"curriculum:{row.id}"
+
+def create_skill_bundle(candidate):
+    with SessionLocal() as db:
+        payload = candidate["structured_payload"]
+        row = SkillBundleORM(
+            candidate_id=candidate["candidate_id"],
+            skill_name=candidate["title"],
+            domain=candidate["pack_id"],
+            prerequisites_json=json.dumps(payload.get("prerequisites", [])),
+            expected_inputs_json=json.dumps(payload.get("expected_inputs", ["text"])),
+            failure_modes_json=json.dumps(payload.get("failure_modes", ["misapplied concept"])),
+            validation_checks_json=json.dumps(payload.get("validation_checks", ["can explain concept clearly"])),
+            canonical_examples_json=json.dumps(payload.get("canonical_examples", [candidate["summary"]])),
+            status="draft",
+            current_version=1,
+            created_at=now_iso(),
+        )
+        db.add(row)
+        db.commit()
+        db.refresh(row)
+        _create_version("skill_bundle", row.id, 1, {
+            "skill_name": row.skill_name,
+            "domain": row.domain,
+            "prerequisites": json.loads(row.prerequisites_json or "[]"),
+            "expected_inputs": json.loads(row.expected_inputs_json or "[]"),
+            "failure_modes": json.loads(row.failure_modes_json or "[]"),
+            "validation_checks": json.loads(row.validation_checks_json or "[]"),
+            "canonical_examples": json.loads(row.canonical_examples_json or "[]"),
+        }, 1, "Initial version")
+        return f"skill:{row.id}"
+
+def create_promotion(candidate_id: int, promoted_by: int, payload):
+    candidate = get_candidate(candidate_id)
+    if candidate is None:
+        return None
+    target_object_id = payload.target_object_id
+    if not target_object_id:
+        if payload.promotion_target == "pack_improvement":
+            target_object_id = create_pack_patch(candidate)
+        elif payload.promotion_target == "curriculum_draft":
+            target_object_id = create_curriculum_draft(candidate)
+        elif payload.promotion_target == "reusable_skill_bundle":
+            target_object_id = create_skill_bundle(candidate)
+        elif payload.promotion_target == "archive":
+            target_object_id = "archive:auto"
+    with SessionLocal() as db:
+        row = PromotionRecordORM(
+            candidate_id=candidate_id,
+            promotion_target=payload.promotion_target,
+            target_object_id=target_object_id,
+            promotion_status=payload.promotion_status,
+            promoted_by=promoted_by,
+            created_at=now_iso(),
+        )
+        db.add(row)
+        cand = db.get(KnowledgeCandidateORM, candidate_id)
+        if cand:
+            cand.current_status = "promoted" if payload.promotion_target != "archive" else "archived"
+            cand.triage_lane = payload.promotion_target
+        db.commit()
+        db.refresh(row)
+        return row.id
+
+def list_promotions():
+    with SessionLocal() as db:
+        rows = db.execute(select(PromotionRecordORM).order_by(PromotionRecordORM.id.desc())).scalars().all()
+        return [{
+            "promotion_id": r.id,
+            "candidate_id": r.candidate_id,
+            "promotion_target": r.promotion_target,
+            "target_object_id": r.target_object_id,
+            "promotion_status": r.promotion_status,
+            "promoted_by": r.promoted_by,
+            "created_at": r.created_at,
+        } for r in rows]
+
+def list_pack_patches():
+    with SessionLocal() as db:
+        rows = db.execute(select(PackPatchProposalORM).order_by(PackPatchProposalORM.id.desc())).scalars().all()
+        return [{
+            "patch_id": r.id,
+            "candidate_id": r.candidate_id,
+            "pack_id": r.pack_id,
+            "patch_type": r.patch_type,
+            "title": r.title,
+            "proposed_change": json.loads(r.proposed_change_json or "{}"),
+            "evidence_summary": r.evidence_summary,
+            "reviewer_notes": r.reviewer_notes,
+            "status": r.status,
+            "current_version": r.current_version,
+            "created_at": r.created_at,
+        } for r in rows]
+
+def list_curriculum_drafts():
+    with SessionLocal() as db:
+        rows = db.execute(select(CurriculumDraftORM).order_by(CurriculumDraftORM.id.desc())).scalars().all()
+        return [{
+            "draft_id": r.id,
+            "candidate_id": r.candidate_id,
+            "topic_focus": r.topic_focus,
+            "product_type": r.product_type,
+            "audience": r.audience,
+            "source_concepts": json.loads(r.source_concepts_json or "[]"),
+            "content_markdown": r.content_markdown,
+            "editorial_notes": r.editorial_notes,
+            "status": r.status,
+            "current_version": r.current_version,
+            "created_at": r.created_at,
+        } for r in rows]
+
+def list_skill_bundles():
+    with SessionLocal() as db:
+        rows = db.execute(select(SkillBundleORM).order_by(SkillBundleORM.id.desc())).scalars().all()
+        return [{
+            "skill_bundle_id": r.id,
+            "candidate_id": r.candidate_id,
+            "skill_name": r.skill_name,
+            "domain": r.domain,
+            "prerequisites": json.loads(r.prerequisites_json or "[]"),
+            "expected_inputs": json.loads(r.expected_inputs_json or "[]"),
+            "failure_modes": json.loads(r.failure_modes_json or "[]"),
+            "validation_checks": json.loads(r.validation_checks_json or "[]"),
+            "canonical_examples": json.loads(r.canonical_examples_json or "[]"),
+            "status": r.status,
+            "current_version": r.current_version,
+            "created_at": r.created_at,
+        } for r in rows]
+
+def get_pack_patch(patch_id: int):
+    with SessionLocal() as db:
+        r = db.get(PackPatchProposalORM, patch_id)
+        if r is None: return None
+        return {
+            "patch_id": r.id, "pack_id": r.pack_id, "title": r.title,
+            "proposed_change": json.loads(r.proposed_change_json or "{}"),
+            "reviewer_notes": r.reviewer_notes, "status": r.status, "current_version": r.current_version
+        }
+
+def get_curriculum_draft(draft_id: int):
+    with SessionLocal() as db:
+        r = db.get(CurriculumDraftORM, draft_id)
+        if r is None: return None
+        return {
+            "draft_id": r.id, "topic_focus": r.topic_focus, "product_type": r.product_type,
+            "audience": r.audience, "source_concepts": json.loads(r.source_concepts_json or "[]"),
+            "content_markdown": r.content_markdown, "editorial_notes": r.editorial_notes,
+            "status": r.status, "current_version": r.current_version
+        }
+
+def get_skill_bundle(bundle_id: int):
+    with SessionLocal() as db:
+        r = db.get(SkillBundleORM, bundle_id)
+        if r is None: return None
+        return {
+            "skill_bundle_id": r.id, "skill_name": r.skill_name, "domain": r.domain,
+            "prerequisites": json.loads(r.prerequisites_json or "[]"),
+            "expected_inputs": json.loads(r.expected_inputs_json or "[]"),
+            "failure_modes": json.loads(r.failure_modes_json or "[]"),
+            "validation_checks": json.loads(r.validation_checks_json or "[]"),
+            "canonical_examples": json.loads(r.canonical_examples_json or "[]"),
+            "status": r.status, "current_version": r.current_version
+        }
+
+def _create_version(object_kind: str, object_id: int, version_number: int, payload: dict, editor_id: int, note: str):
+    with SessionLocal() as db:
+        db.add(ObjectVersionORM(
+            object_kind=object_kind,
+            object_id=object_id,
+            version_number=version_number,
+            payload_json=json.dumps(payload),
+            editor_id=editor_id,
+            note=note,
+            created_at=now_iso(),
+        ))
+        db.commit()
+
+def list_versions(object_kind: str, object_id: int):
+    with SessionLocal() as db:
+        rows = db.execute(
+            select(ObjectVersionORM)
+            .where(ObjectVersionORM.object_kind == object_kind, ObjectVersionORM.object_id == object_id)
+            .order_by(ObjectVersionORM.version_number.desc())
+        ).scalars().all()
+        return [{
+            "version_id": r.id,
+            "object_kind": r.object_kind,
+            "object_id": r.object_id,
+            "version_number": r.version_number,
+            "payload": json.loads(r.payload_json or "{}"),
+            "editor_id": r.editor_id,
+            "note": r.note,
+            "created_at": r.created_at,
+        } for r in rows]
+
+def edit_pack_patch(patch_id: int, payload: dict, editor_id: int, note: str):
+    with SessionLocal() as db:
+        row = db.get(PackPatchProposalORM, patch_id)
+        if row is None: return None
+        if "title" in payload: row.title = payload["title"]
+        if "proposed_change" in payload: row.proposed_change_json = json.dumps(payload["proposed_change"])
+        if "reviewer_notes" in payload: row.reviewer_notes = payload["reviewer_notes"]
+        if "status" in payload: row.status = payload["status"]
+        row.current_version += 1
+        db.commit()
+        db.refresh(row)
+    _create_version("pack_patch", patch_id, row.current_version, {
+        "title": row.title,
+        "proposed_change": json.loads(row.proposed_change_json or "{}"),
+        "reviewer_notes": row.reviewer_notes,
+        "status": row.status,
+    }, editor_id, note)
+    return row
+
+def edit_curriculum_draft(draft_id: int, payload: dict, editor_id: int, note: str):
+    with SessionLocal() as db:
+        row = db.get(CurriculumDraftORM, draft_id)
+        if row is None: return None
+        if "topic_focus" in payload: row.topic_focus = payload["topic_focus"]
+        if "content_markdown" in payload: row.content_markdown = payload["content_markdown"]
+        if "editorial_notes" in payload: row.editorial_notes = payload["editorial_notes"]
+        if "status" in payload: row.status = payload["status"]
+        row.current_version += 1
+        db.commit()
+        db.refresh(row)
+    _create_version("curriculum_draft", draft_id, row.current_version, {
+        "topic_focus": row.topic_focus,
+        "content_markdown": row.content_markdown,
+        "editorial_notes": row.editorial_notes,
+        "status": row.status,
+    }, editor_id, note)
+    return row
+
+def edit_skill_bundle(bundle_id: int, payload: dict, editor_id: int, note: str):
+    with SessionLocal() as db:
+        row = db.get(SkillBundleORM, bundle_id)
+        if row is None: return None
+        if "skill_name" in payload: row.skill_name = payload["skill_name"]
+        if "prerequisites" in payload: row.prerequisites_json = json.dumps(payload["prerequisites"])
+        if "expected_inputs" in payload: row.expected_inputs_json = json.dumps(payload["expected_inputs"])
+        if "failure_modes" in payload: row.failure_modes_json = json.dumps(payload["failure_modes"])
+        if "validation_checks" in payload: row.validation_checks_json = json.dumps(payload["validation_checks"])
+        if "canonical_examples" in payload: row.canonical_examples_json = json.dumps(payload["canonical_examples"])
+        if "status" in payload: row.status = payload["status"]
+        row.current_version += 1
+        db.commit()
+        db.refresh(row)
+    _create_version("skill_bundle", bundle_id, row.current_version, {
+        "skill_name": row.skill_name,
+        "prerequisites": json.loads(row.prerequisites_json or "[]"),
+        "expected_inputs": json.loads(row.expected_inputs_json or "[]"),
+        "failure_modes": json.loads(row.failure_modes_json or "[]"),
+        "validation_checks": json.loads(row.validation_checks_json or "[]"),
+        "canonical_examples": json.loads(row.canonical_examples_json or "[]"),
+        "status": row.status,
+    }, editor_id, note)
+    return row
+
+def apply_pack_patch(patch_id: int, editor_id: int, note: str):
+    with SessionLocal() as db:
+        patch = db.get(PackPatchProposalORM, patch_id)
+        if patch is None: return None
+        pack = db.get(PackORM, patch.pack_id)
+        if pack is None: return None
+        pack_data = json.loads(pack.data_json or "{}")
+        proposed = json.loads(patch.proposed_change_json or "{}")
+        pack_data.setdefault("applied_patches", []).append({
+            "patch_id": patch.id,
+            "title": patch.title,
+            "proposed_change": proposed,
+            "applied_at": now_iso(),
+        })
+        if "affected_concept" in proposed and "suggested_prereq" in proposed:
+            for concept in pack_data.get("concepts", []):
+                if concept.get("id") == proposed["affected_concept"]:
+                    prereqs = concept.setdefault("prerequisites", [])
+                    if proposed["suggested_prereq"] not in prereqs:
+                        prereqs.append(proposed["suggested_prereq"])
+        pack.data_json = json.dumps(pack_data)
+        patch.status = "applied"
+        db.commit()
+        db.refresh(patch)
+    _create_version("pack_patch", patch_id, patch.current_version, {
+        "title": patch.title,
+        "proposed_change": json.loads(patch.proposed_change_json or "{}"),
+        "status": patch.status,
+    }, editor_id, note)
+    return patch
+
+def export_curriculum_draft(draft_id: int):
+    draft = get_curriculum_draft(draft_id)
+    if draft is None: return None
+    return {
+        "markdown": draft["content_markdown"],
+        "json": json.dumps(draft, indent=2)
+    }
+
+def export_skill_bundle(bundle_id: int):
+    import yaml
+    bundle = get_skill_bundle(bundle_id)
+    if bundle is None: return None
+    return {
+        "json": json.dumps(bundle, indent=2),
+        "yaml": yaml.safe_dump(bundle, sort_keys=False)
+    }
+
+def create_synthesis_candidate(source_concept_id, target_concept_id, source_pack_id, target_pack_id, synthesis_kind, score_semantic, score_structural, score_trajectory, score_review_history, explanation, evidence):
+    score_total = 0.35 * score_semantic + 0.25 * score_structural + 0.20 * score_trajectory + 0.10 * score_review_history + 0.10 * evidence.get("novelty", 0.0)
+    with SessionLocal() as db:
+        row = SynthesisCandidateORM(
+            source_concept_id=source_concept_id, target_concept_id=target_concept_id,
+            source_pack_id=source_pack_id, target_pack_id=target_pack_id,
+            synthesis_kind=synthesis_kind, score_total=score_total,
+            score_semantic=score_semantic, score_structural=score_structural,
+            score_trajectory=score_trajectory, score_review_history=score_review_history,
+            explanation=explanation, evidence_json=json.dumps(evidence),
+            current_status="proposed", created_at=now_iso(),
+        )
+        db.add(row); db.commit(); db.refresh(row); return row.id
+
+def list_synthesis_candidates():
+    with SessionLocal() as db:
+        rows = db.execute(select(SynthesisCandidateORM).order_by(SynthesisCandidateORM.score_total.desc(), SynthesisCandidateORM.id.desc())).scalars().all()
+        return [{
+            "synthesis_id": r.id, "source_concept_id": r.source_concept_id, "target_concept_id": r.target_concept_id,
+            "source_pack_id": r.source_pack_id, "target_pack_id": r.target_pack_id, "synthesis_kind": r.synthesis_kind,
+            "score_total": r.score_total, "score_semantic": r.score_semantic, "score_structural": r.score_structural,
+            "score_trajectory": r.score_trajectory, "score_review_history": r.score_review_history,
+            "explanation": r.explanation, "evidence": json.loads(r.evidence_json or "{}"),
+            "current_status": r.current_status, "created_at": r.created_at,
+        } for r in rows]
+
+def get_synthesis_candidate(synthesis_id: int):
+    with SessionLocal() as db:
+        r = db.get(SynthesisCandidateORM, synthesis_id)
+        if r is None: return None
+        return {
+            "synthesis_id": r.id, "source_concept_id": r.source_concept_id, "target_concept_id": r.target_concept_id,
+            "source_pack_id": r.source_pack_id, "target_pack_id": r.target_pack_id, "synthesis_kind": r.synthesis_kind,
+            "score_total": r.score_total, "score_semantic": r.score_semantic, "score_structural": r.score_structural,
+            "score_trajectory": r.score_trajectory, "score_review_history": r.score_review_history,
+            "explanation": r.explanation, "evidence": json.loads(r.evidence_json or "{}"),
+            "current_status": r.current_status, "created_at": r.created_at,
+        }
diff --git a/src/didactopus/seed.py b/src/didactopus/seed.py
index bdc7b86..7541e63 100644
--- a/src/didactopus/seed.py
+++ b/src/didactopus/seed.py
@@ -1,34 +1,53 @@
 from __future__ import annotations
+import json
 from sqlalchemy import select
 from .db import Base, engine, SessionLocal
-from .orm import UserORM
+from .orm import UserORM, PackORM
 from .auth import hash_password
-from .repository import upsert_pack, create_learner
-from .models import PackData, PackConcept, GraphPosition, CrossPackLink
 
 def main():
     Base.metadata.create_all(bind=engine)
     with SessionLocal() as db:
         if db.execute(select(UserORM).where(UserORM.username == "wesley")).scalar_one_or_none() is None:
             db.add(UserORM(username="wesley", password_hash=hash_password("demo-pass"), role="admin", is_active=True))
+        if db.execute(select(UserORM).where(UserORM.username == "reviewer")).scalar_one_or_none() is None:
+            db.add(UserORM(username="reviewer", password_hash=hash_password("demo-pass"), role="reviewer", is_active=True))
+        if db.get(PackORM, "biology-pack") is None:
+            db.add(PackORM(
+                id="biology-pack",
+                owner_user_id=1,
+                policy_lane="personal",
+                title="Biology Pack",
+                subtitle="Core biology concepts",
+                level="novice-friendly",
+                is_published=True,
+                data_json=json.dumps({
+                    "id": "biology-pack",
+                    "title": "Biology Pack",
+                    "concepts": [
+                        {"id": "selection", "title": "Natural Selection", "prerequisites": ["variation"]},
+                        {"id": "variation", "title": "Variation", "prerequisites": []},
+                        {"id": "drift", "title": "Genetic Drift", "prerequisites": ["variation"]}
+                    ]
+                })
+            ))
+        if db.get(PackORM, "math-pack") is None:
+            db.add(PackORM(
+                id="math-pack",
+                owner_user_id=1,
+                policy_lane="personal",
+                title="Math Pack",
+                subtitle="Core math concepts",
+                level="novice-friendly",
+                is_published=True,
+                data_json=json.dumps({
+                    "id": "math-pack",
+                    "title": "Math Pack",
+                    "concepts": [
+                        {"id": "random_walk", "title": "Random Walk", "prerequisites": ["variation"]},
+                        {"id": "variation", "title": "Variation in Models", "prerequisites": []},
+                        {"id": "optimization", "title": "Optimization", "prerequisites": []}
+                    ]
+                })
+            ))
         db.commit()
-    create_learner(1, "wesley-learner", "Wesley learner")
-    upsert_pack(
-        PackData(
-            id="wesley-private-pack",
-            title="Wesley Private Pack",
-            subtitle="Personal pack example.",
-            level="novice-friendly",
-            concepts=[
-                PackConcept(id="intro", title="Intro", prerequisites=[], position=GraphPosition(x=150, y=120)),
-                PackConcept(id="second", title="Second concept", prerequisites=["intro"], position=GraphPosition(x=420, y=120)),
-                PackConcept(id="third", title="Third concept", prerequisites=["second"], position=GraphPosition(x=700, y=120), cross_pack_links=[CrossPackLink(source_concept_id="third", target_pack_id="advanced-pack", target_concept_id="adv-1", relationship="next_pack")]),
-                PackConcept(id="branch", title="Branch concept", prerequisites=["intro"], position=GraphPosition(x=420, y=320)),
-            ],
-            onboarding={"headline":"Start privately"},
-            compliance={}
-        ),
-        submitted_by_user_id=1,
-        policy_lane="personal",
-        is_published=True,
-    )
diff --git a/src/didactopus/synthesis.py b/src/didactopus/synthesis.py
index a980f75..feced7a 100644
--- a/src/didactopus/synthesis.py
+++ b/src/didactopus/synthesis.py
@@ -14,57 +14,35 @@ def _norm(text: str) -> set[str]:
 def _semantic_similarity(a: dict, b: dict) -> float:
     sa = _norm(a.get("title", "")) | _norm(" ".join(a.get("prerequisites", [])))
     sb = _norm(b.get("title", "")) | _norm(" ".join(b.get("prerequisites", [])))
-    if not sa or not sb:
-        return 0.0
+    if not sa or not sb: return 0.0
     return len(sa & sb) / len(sa | sb)
 
 def _structural_similarity(a: dict, b: dict) -> float:
-    pa = set(a.get("prerequisites", []))
-    pb = set(b.get("prerequisites", []))
-    if not pa and not pb:
-        return 0.6
-    if not pa or not pb:
-        return 0.2
+    pa = set(a.get("prerequisites", [])); pb = set(b.get("prerequisites", []))
+    if not pa and not pb: return 0.6
+    if not pa or not pb: return 0.2
     return len(pa & pb) / len(pa | pb)
 
 def generate_synthesis_candidates(source_pack_id: str | None = None, target_pack_id: str | None = None, limit: int = 20):
-    packs = list_packs()
-    by_id = {p.id: p for p in packs}
+    packs = list_packs(); by_id = {p.id: p for p in packs}
     source_packs = [by_id[source_pack_id]] if source_pack_id and source_pack_id in by_id else packs
     target_packs = [by_id[target_pack_id]] if target_pack_id and target_pack_id in by_id else packs
-
-    created = []
-    seen = set()
+    created = []; seen = set()
     for sp in source_packs:
         for tp in target_packs:
-            if sp.id == tp.id:
-                continue
+            if sp.id == tp.id: continue
             for ca in _concepts(sp):
                 for cb in _concepts(tp):
-                    sem = _semantic_similarity(ca, cb)
-                    struct = _structural_similarity(ca, cb)
-                    traj = 0.4
-                    review_prior = 0.5
-                    novelty = 1.0 if (ca.get("id"), cb.get("id")) not in seen else 0.0
+                    sem = _semantic_similarity(ca, cb); struct = _structural_similarity(ca, cb)
+                    traj = 0.4; review_prior = 0.5; novelty = 1.0 if (ca.get("id"), cb.get("id")) not in seen else 0.0
                     total = 0.35 * sem + 0.25 * struct + 0.20 * traj + 0.10 * review_prior + 0.10 * novelty
-                    if total < 0.45:
-                        continue
-                    explanation = f"Possible cross-pack overlap between '{ca.get('title')}' and '{cb.get('title')}'."
+                    if total < 0.45: continue
                     sid = create_synthesis_candidate(
-                        source_concept_id=ca.get("id", ""),
-                        target_concept_id=cb.get("id", ""),
-                        source_pack_id=sp.id,
-                        target_pack_id=tp.id,
-                        synthesis_kind="cross_pack_similarity",
-                        score_semantic=sem,
-                        score_structural=struct,
-                        score_trajectory=traj,
-                        score_review_history=review_prior,
-                        explanation=explanation,
-                        evidence={"novelty": novelty, "source_title": ca.get("title"), "target_title": cb.get("title")},
+                        ca.get("id", ""), cb.get("id", ""), sp.id, tp.id, "cross_pack_similarity",
+                        sem, struct, traj, review_prior,
+                        f"Possible cross-pack overlap between '{ca.get('title')}' and '{cb.get('title')}'.",
+                        {"novelty": novelty, "source_title": ca.get("title"), "target_title": cb.get("title")}
                     )
-                    seen.add((ca.get("id"), cb.get("id")))
-                    created.append(sid)
-                    if len(created) >= limit:
-                        return created
+                    seen.add((ca.get("id"), cb.get("id"))); created.append(sid)
+                    if len(created) >= limit: return created
     return created
diff --git a/tests/test_scaffold_files.py b/tests/test_scaffold_files.py
index a8a1f89..8e2954a 100644
--- a/tests/test_scaffold_files.py
+++ b/tests/test_scaffold_files.py
@@ -3,6 +3,5 @@ from pathlib import Path
 def test_scaffold_files_exist():
     assert Path("src/didactopus/api.py").exists()
     assert Path("src/didactopus/repository.py").exists()
-    assert Path("src/didactopus/worker.py").exists()
-    assert Path("src/didactopus/knowledge_export.py").exists()
-    assert Path("FAQ.md").exists()
+    assert Path("src/didactopus/orm.py").exists()
+    assert Path("webui/src/App.jsx").exists()
diff --git a/webui/index.html b/webui/index.html
index bce756b..5520378 100644
--- a/webui/index.html
+++ b/webui/index.html
@@ -3,7 +3,7 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Didactopus Artifact Lifecycle</title>
+    <title>Didactopus Object Versioning</title>
     <script type="module" src="/src/main.jsx"></script>
   </head>
   <body><div id="root"></div></body>
diff --git a/webui/package.json b/webui/package.json
index be233a0..698831a 100644
--- a/webui/package.json
+++ b/webui/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "didactopus-artifact-lifecycle-ui",
+  "name": "didactopus-object-versioning-ui",
   "private": true,
   "version": "0.1.0",
   "type": "module",
diff --git a/webui/src/App.jsx b/webui/src/App.jsx
index 7b8824a..541814d 100644
--- a/webui/src/App.jsx
+++ b/webui/src/App.jsx
@@ -1,120 +1,153 @@
 import React, { useEffect, useState } from "react";
-import { login, refresh, fetchPacks, fetchLearnerState, putLearnerState, createRenderJob, listRenderJobs, listArtifacts, updateRetention, exportKnowledge } from "./api";
-import { loadAuth, saveAuth, clearAuth } from "./authStore";
+import { login, createCandidate, promoteCandidate, listPackPatches, listCurriculumDrafts, listSkillBundles, editPatch, applyPatch, editCurriculum, editSkill, listVersions, exportCurriculum, exportSkill } from "./api";
 
 function LoginView({ onAuth }) {
-  const [username, setUsername] = useState("wesley");
+  const [username, setUsername] = useState("reviewer");
   const [password, setPassword] = useState("demo-pass");
   const [error, setError] = useState("");
   async function doLogin() {
-    try {
-      const result = await login(username, password);
-      saveAuth(result);
-      onAuth(result);
-    } catch { setError("Login failed"); }
+    try { onAuth(await login(username, password)); }
+    catch { setError("Login failed"); }
   }
   return (
-    <div className="page narrow-page">
-      <section className="card narrow">
-        <h1>Didactopus login</h1>
-        <label>Username<input value={username} onChange={(e) => setUsername(e.target.value)} /></label>
-        <label>Password<input type="password" value={password} onChange={(e) => setPassword(e.target.value)} /></label>
-        <button className="primary" onClick={doLogin}>Login</button>
-        {error ? <div className="error">{error}</div> : null}
-      </section>
-    </div>
+    <div className="page narrow"><section className="card">
+      <h1>Didactopus object versioning</h1>
+      <label>Username<input value={username} onChange={(e)=>setUsername(e.target.value)} /></label>
+      <label>Password<input type="password" value={password} onChange={(e)=>setPassword(e.target.value)} /></label>
+      <button className="primary" onClick={doLogin}>Login</button>
+      {error ? <div className="error">{error}</div> : null}
+    </section></div>
   );
 }
 
 export default function App() {
-  const [auth, setAuth] = useState(loadAuth());
-  const [packs, setPacks] = useState([]);
-  const [learnerId] = useState("wesley-learner");
-  const [packId, setPackId] = useState("");
-  const [jobs, setJobs] = useState([]);
-  const [artifacts, setArtifacts] = useState([]);
-  const [knowledge, setKnowledge] = useState(null);
-  const [format, setFormat] = useState("gif");
-  const [fps, setFps] = useState(2);
+  const [auth, setAuth] = useState(null);
+  const [patches, setPatches] = useState([]);
+  const [drafts, setDrafts] = useState([]);
+  const [skills, setSkills] = useState([]);
+  const [versions, setVersions] = useState([]);
+  const [exports, setExports] = useState({});
   const [message, setMessage] = useState("");
 
-  async function refreshAuthToken() {
-    if (!auth?.refresh_token) return null;
-    try {
-      const result = await refresh(auth.refresh_token);
-      saveAuth(result);
-      setAuth(result);
-      return result;
-    } catch {
-      clearAuth();
-      setAuth(null);
-      return null;
-    }
+  async function reload(token = auth?.access_token) {
+    if (!token) return;
+    const [p, d, s] = await Promise.all([listPackPatches(token), listCurriculumDrafts(token), listSkillBundles(token)]);
+    setPatches(p); setDrafts(d); setSkills(s);
   }
 
-  async function guarded(fn) {
-    try { return await fn(auth.access_token); }
-    catch {
-      const next = await refreshAuthToken();
-      if (!next) throw new Error("auth failed");
-      return await fn(next.access_token);
-    }
+  useEffect(() => { if (auth?.access_token) reload(auth.access_token); }, [auth]);
+
+  async function seedAll() {
+    const candidate = await createCandidate(auth.access_token, {
+      source_type: "learner_export",
+      learner_id: "wesley-learner",
+      pack_id: "biology-pack",
+      candidate_kind: "hidden_prerequisite",
+      title: "Probability intuition before drift",
+      summary: "Learner evidence suggests drift is easier after random-process intuition.",
+      structured_payload: {
+        affected_concept: "drift",
+        suggested_prereq: "random_walk",
+        source_concepts: ["drift", "variation"],
+        prerequisites: ["variation", "random_walk"],
+        expected_inputs: ["text", "example"],
+        failure_modes: ["treating drift as directional"],
+        validation_checks: ["explains stochastic change"],
+        canonical_examples: ["coin-flip drift example"]
+      },
+      evidence_summary: "Repeated learner confusion with stochastic interpretation.",
+      confidence_hint: 0.8,
+      novelty_score: 0.7,
+      synthesis_score: 0.6,
+      triage_lane: "pack_improvement"
+    });
+    const candidateId = candidate.candidate_id;
+    await promoteCandidate(auth.access_token, candidateId, { promotion_target: "pack_improvement", target_object_id: "", promotion_status: "approved" });
+
+    const c2 = await createCandidate(auth.access_token, {
+      source_type: "learner_export",
+      learner_id: "wesley-learner",
+      pack_id: "biology-pack",
+      candidate_kind: "lesson_outline",
+      title: "Intro lesson on stochastic evolutionary change",
+      summary: "A lesson framing drift through random processes.",
+      structured_payload: { source_concepts: ["drift", "variation", "random_walk"] },
+      evidence_summary: "Good bridge opportunity for cross-pack synthesis.",
+      confidence_hint: 0.72,
+      novelty_score: 0.6,
+      synthesis_score: 0.75,
+      triage_lane: "curriculum_draft"
+    });
+    await promoteCandidate(auth.access_token, c2.candidate_id, { promotion_target: "curriculum_draft", target_object_id: "", promotion_status: "approved" });
+
+    const c3 = await createCandidate(auth.access_token, {
+      source_type: "learner_export",
+      learner_id: "wesley-learner",
+      pack_id: "biology-pack",
+      candidate_kind: "skill_bundle_candidate",
+      title: "Explain stochastic biological change",
+      summary: "Skill for recognizing and explaining stochastic population change.",
+      structured_payload: {
+        prerequisites: ["variation", "random_walk"],
+        expected_inputs: ["question", "scenario"],
+        failure_modes: ["teleological explanation"],
+        validation_checks: ["distinguishes drift from selection"],
+        canonical_examples: ["small population allele frequency drift"]
+      },
+      evidence_summary: "Could be reusable as an agent skill.",
+      confidence_hint: 0.74,
+      novelty_score: 0.58,
+      synthesis_score: 0.71,
+      triage_lane: "reusable_skill_bundle"
+    });
+    await promoteCandidate(auth.access_token, c3.candidate_id, { promotion_target: "reusable_skill_bundle", target_object_id: "", promotion_status: "approved" });
+
+    await reload();
+    setMessage("Seeded patch, curriculum draft, and skill bundle.");
   }
 
-  async function reloadLists() {
-    setJobs(await guarded((token) => listRenderJobs(token, learnerId)));
-    setArtifacts(await guarded((token) => listArtifacts(token, learnerId)));
+  async function inspectVersions(kind, id) {
+    const data = await listVersions(auth.access_token, kind, id);
+    setVersions(data);
   }
 
-  useEffect(() => {
-    if (!auth) return;
-    async function load() {
-      const p = await guarded((token) => fetchPacks(token));
-      setPacks(p);
-      setPackId(p[0]?.id || "");
-      await reloadLists();
-    }
-    load();
-  }, [auth]);
-
-  async function generateDemo() {
-    let state = await guarded((token) => fetchLearnerState(token, learnerId));
-    const base = Date.now();
-    const events = [
-      ["intro", 0.30, "exercise", 0],
-      ["intro", 0.78, "review", 1000],
-      ["second", 0.42, "exercise", 2000],
-      ["second", 0.72, "review", 3000],
-      ["third", 0.25, "exercise", 4000],
-      ["branch", 0.60, "exercise", 5000],
-    ];
-    const latest = {};
-    for (const [cid, score, kind, offset] of events) {
-      const ts = new Date(base + offset).toISOString();
-      state.history.push({ concept_id: cid, dimension: "mastery", score, confidence_hint: 0.6, timestamp: ts, kind, source_id: `demo-${cid}-${offset}` });
-      latest[cid] = { concept_id: cid, dimension: "mastery", score, confidence: Math.min(0.9, score), evidence_count: (latest[cid]?.evidence_count || 0) + 1, last_updated: ts };
-    }
-    state.records = Object.values(latest);
-    await guarded((token) => putLearnerState(token, learnerId, state));
-    setMessage("Demo state generated.");
+  async function revisePatch(id) {
+    await editPatch(auth.access_token, id, {
+      payload: { reviewer_notes: "Elevated priority after synthesis review.", status: "approved" },
+      note: "Reviewer note update"
+    });
+    await reload();
   }
 
-  async function createJob() {
-    const result = await guarded((token) => createRenderJob(token, learnerId, packId, { learner_id: learnerId, pack_id: packId, format, fps, theme: "default", retention_class: "standard", retention_days: 30 }));
-    setMessage(`Render job ${result.job_id} queued.`);
-    setTimeout(() => reloadLists(), 500);
+  async function applySelectedPatch(id) {
+    await applyPatch(auth.access_token, id, { note: "Merged into pack JSON" });
+    await reload();
   }
 
-  async function changeRetention(artifactId) {
-    await guarded((token) => updateRetention(token, artifactId, { retention_class: "archive", retention_days: 365 }));
-    await reloadLists();
-    setMessage(`Artifact ${artifactId} retention updated.`);
+  async function reviseDraft(id) {
+    await editCurriculum(auth.access_token, id, {
+      payload: { editorial_notes: "Add random-walk bridge example.", status: "editorial_review" },
+      note: "Editorial refinement"
+    });
+    await reload();
   }
 
-  async function runKnowledgeExport() {
-    const result = await guarded((token) => exportKnowledge(token, learnerId, packId, { learner_id: learnerId, pack_id: packId, export_kind: "knowledge_snapshot" }));
-    setKnowledge(result);
-    setMessage("Knowledge export generated.");
+  async function reviseSkill(id) {
+    await editSkill(auth.access_token, id, {
+      payload: { status: "validation", validation_checks: ["distinguishes drift from selection", "uses stochastic terminology correctly"] },
+      note: "Validation criteria strengthened"
+    });
+    await reload();
+  }
+
+  async function doExportDraft(id) {
+    const out = await exportCurriculum(auth.access_token, id);
+    setExports(prev => ({ ...prev, ["draft:"+id]: out }));
+  }
+
+  async function doExportSkill(id) {
+    const out = await exportSkill(auth.access_token, id);
+    setExports(prev => ({ ...prev, ["skill:"+id]: out }));
   }
 
   if (!auth) return <LoginView onAuth={setAuth} />;
@@ -123,46 +156,65 @@ export default function App() {
     <div className="page">
       <header className="hero">
         <div>
-          <h1>Didactopus artifact lifecycle + knowledge export</h1>
-          <p>Manage artifact retention and turn learner state into reusable knowledge outputs.</p>
+          <h1>Object editing, versioning, apply, and export</h1>
+          <p>Promoted objects can now be revised, versioned, merged into packs, and exported in reusable formats.</p>
           <div className="muted">{message}</div>
         </div>
-        <div className="controls">
-          <label>Pack
-            <select value={packId} onChange={(e) => setPackId(e.target.value)}>
-              {packs.map((p) => <option key={p.id} value={p.id}>{p.title}</option>)}
-            </select>
-          </label>
-          <label>Format
-            <select value={format} onChange={(e) => setFormat(e.target.value)}>
-              <option value="gif">GIF</option>
-              <option value="mp4">MP4</option>
-            </select>
-          </label>
-          <label>FPS
-            <input type="number" value={fps} onChange={(e) => setFps(Number(e.target.value || 2))} />
-          </label>
-          <button onClick={generateDemo}>Generate demo state</button>
-          <button onClick={createJob}>Create render job</button>
-          <button onClick={runKnowledgeExport}>Export knowledge</button>
-          <button onClick={reloadLists}>Refresh lists</button>
-          <button onClick={() => { clearAuth(); setAuth(null); }}>Logout</button>
+        <div className="toolbar">
+          <button onClick={seedAll}>Seed all objects</button>
+          <button onClick={() => reload()}>Refresh</button>
         </div>
       </header>
 
-      <main className="layout threecol">
-        <section className="card">
-          <h2>Render jobs</h2>
-          <pre className="prebox">{JSON.stringify(jobs, null, 2)}</pre>
+      <main className="grid3">
+        <section>
+          <h2>Pack patches</h2>
+          <div className="stack">
+            {patches.map(p => (
+              <div key={p.patch_id} className="card small">
+                <h3>{p.title}</h3>
+                <div className="muted">v{p.current_version} · {p.status}</div>
+                <pre>{JSON.stringify(p.proposed_change, null, 2)}</pre>
+                <button onClick={() => revisePatch(p.patch_id)}>Revise</button>
+                <button onClick={() => applySelectedPatch(p.patch_id)}>Apply to pack</button>
+                <button onClick={() => inspectVersions("pack_patch", p.patch_id)}>Versions</button>
+              </div>
+            ))}
+          </div>
         </section>
-        <section className="card">
-          <h2>Artifacts</h2>
-          <pre className="prebox">{JSON.stringify(artifacts, null, 2)}</pre>
-          {artifacts[0] ? <button onClick={() => changeRetention(artifacts[0].artifact_id)}>Archive newest artifact</button> : null}
+        <section>
+          <h2>Curriculum drafts</h2>
+          <div className="stack">
+            {drafts.map(d => (
+              <div key={d.draft_id} className="card small">
+                <h3>{d.topic_focus}</h3>
+                <div className="muted">v{d.current_version} · {d.status}</div>
+                <pre>{d.content_markdown}</pre>
+                <button onClick={() => reviseDraft(d.draft_id)}>Revise</button>
+                <button onClick={() => inspectVersions("curriculum_draft", d.draft_id)}>Versions</button>
+                <button onClick={() => doExportDraft(d.draft_id)}>Export</button>
+                {exports["draft:"+d.draft_id] ? <pre>{JSON.stringify(exports["draft:"+d.draft_id], null, 2)}</pre> : null}
+              </div>
+            ))}
+            <h2>Skill bundles</h2>
+            {skills.map(s => (
+              <div key={s.skill_bundle_id} className="card small">
+                <h3>{s.skill_name}</h3>
+                <div className="muted">v{s.current_version} · {s.status}</div>
+                <pre>{JSON.stringify(s, null, 2)}</pre>
+                <button onClick={() => reviseSkill(s.skill_bundle_id)}>Revise</button>
+                <button onClick={() => inspectVersions("skill_bundle", s.skill_bundle_id)}>Versions</button>
+                <button onClick={() => doExportSkill(s.skill_bundle_id)}>Export</button>
+                {exports["skill:"+s.skill_bundle_id] ? <pre>{JSON.stringify(exports["skill:"+s.skill_bundle_id], null, 2)}</pre> : null}
+              </div>
+            ))}
+          </div>
         </section>
-        <section className="card">
-          <h2>Knowledge export</h2>
-          <pre className="prebox">{JSON.stringify(knowledge, null, 2)}</pre>
+        <section>
+          <h2>Version history</h2>
+          <div className="card small">
+            <pre>{JSON.stringify(versions, null, 2)}</pre>
+          </div>
         </section>
       </main>
     </div>
diff --git a/webui/src/api.js b/webui/src/api.js
index 71816cb..5aa6dcb 100644
--- a/webui/src/api.js
+++ b/webui/src/api.js
@@ -1,26 +1,71 @@
 const API = "http://127.0.0.1:8011/api";
-
 function authHeaders(token, json=true) {
   const h = { Authorization: `Bearer ${token}` };
   if (json) h["Content-Type"] = "application/json";
   return h;
 }
-
 export async function login(username, password) {
-  const res = await fetch(`${API}/login`, { method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify({ username, password }) });
+  const res = await fetch(`${API}/login`, { method: "POST", headers: {"Content-Type": "application/json"}, body: JSON.stringify({ username, password })});
   if (!res.ok) throw new Error("login failed");
   return await res.json();
 }
-export async function refresh(refreshToken) {
-  const res = await fetch(`${API}/refresh`, { method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify({ refresh_token: refreshToken }) });
-  if (!res.ok) throw new Error("refresh failed");
+export async function createCandidate(token, payload) {
+  const res = await fetch(`${API}/knowledge-candidates`, { method: "POST", headers: authHeaders(token), body: JSON.stringify(payload) });
+  if (!res.ok) throw new Error("createCandidate failed");
+  return await res.json();
+}
+export async function promoteCandidate(token, candidateId, payload) {
+  const res = await fetch(`${API}/knowledge-candidates/${candidateId}/promote`, { method: "POST", headers: authHeaders(token), body: JSON.stringify(payload) });
+  if (!res.ok) throw new Error("promoteCandidate failed");
+  return await res.json();
+}
+export async function listPackPatches(token) {
+  const res = await fetch(`${API}/pack-patches`, { headers: authHeaders(token, false) });
+  if (!res.ok) throw new Error("listPackPatches failed");
+  return await res.json();
+}
+export async function listCurriculumDrafts(token) {
+  const res = await fetch(`${API}/curriculum-drafts`, { headers: authHeaders(token, false) });
+  if (!res.ok) throw new Error("listCurriculumDrafts failed");
+  return await res.json();
+}
+export async function listSkillBundles(token) {
+  const res = await fetch(`${API}/skill-bundles`, { headers: authHeaders(token, false) });
+  if (!res.ok) throw new Error("listSkillBundles failed");
+  return await res.json();
+}
+export async function editPatch(token, patchId, payload) {
+  const res = await fetch(`${API}/pack-patches/${patchId}/edit`, { method: "POST", headers: authHeaders(token), body: JSON.stringify(payload) });
+  if (!res.ok) throw new Error("editPatch failed");
+  return await res.json();
+}
+export async function applyPatch(token, patchId, payload) {
+  const res = await fetch(`${API}/pack-patches/${patchId}/apply`, { method: "POST", headers: authHeaders(token), body: JSON.stringify(payload) });
+  if (!res.ok) throw new Error("applyPatch failed");
+  return await res.json();
+}
+export async function editCurriculum(token, draftId, payload) {
+  const res = await fetch(`${API}/curriculum-drafts/${draftId}/edit`, { method: "POST", headers: authHeaders(token), body: JSON.stringify(payload) });
+  if (!res.ok) throw new Error("editCurriculum failed");
+  return await res.json();
+}
+export async function editSkill(token, bundleId, payload) {
+  const res = await fetch(`${API}/skill-bundles/${bundleId}/edit`, { method: "POST", headers: authHeaders(token), body: JSON.stringify(payload) });
+  if (!res.ok) throw new Error("editSkill failed");
+  return await res.json();
+}
+export async function listVersions(token, objectKind, objectId) {
+  const res = await fetch(`${API}/object-versions/${objectKind}/${objectId}`, { headers: authHeaders(token, false) });
+  if (!res.ok) throw new Error("listVersions failed");
+  return await res.json();
+}
+export async function exportCurriculum(token, draftId) {
+  const res = await fetch(`${API}/curriculum-drafts/${draftId}/export`, { headers: authHeaders(token, false) });
+  if (!res.ok) throw new Error("exportCurriculum failed");
+  return await res.json();
+}
+export async function exportSkill(token, bundleId) {
+  const res = await fetch(`${API}/skill-bundles/${bundleId}/export`, { headers: authHeaders(token, false) });
+  if (!res.ok) throw new Error("exportSkill failed");
   return await res.json();
 }
-export async function fetchPacks(token) { const res = await fetch(`${API}/packs`, { headers: authHeaders(token, false) }); if (!res.ok) throw new Error("fetchPacks failed"); return await res.json(); }
-export async function fetchLearnerState(token, learnerId) { const res = await fetch(`${API}/learners/${learnerId}/state`, { headers: authHeaders(token, false) }); if (!res.ok) throw new Error("fetchLearnerState failed"); return await res.json(); }
-export async function putLearnerState(token, learnerId, state) { const res = await fetch(`${API}/learners/${learnerId}/state`, { method: "PUT", headers: authHeaders(token), body: JSON.stringify(state) }); if (!res.ok) throw new Error("putLearnerState failed"); return await res.json(); }
-export async function createRenderJob(token, learnerId, packId, payload) { const res = await fetch(`${API}/learners/${learnerId}/render-jobs/${packId}`, { method: "POST", headers: authHeaders(token), body: JSON.stringify(payload) }); if (!res.ok) throw new Error("createRenderJob failed"); return await res.json(); }
-export async function listRenderJobs(token, learnerId) { const res = await fetch(`${API}/render-jobs?learner_id=${encodeURIComponent(learnerId)}`, { headers: authHeaders(token, false) }); if (!res.ok) throw new Error("listRenderJobs failed"); return await res.json(); }
-export async function listArtifacts(token, learnerId) { const res = await fetch(`${API}/artifacts?learner_id=${encodeURIComponent(learnerId)}`, { headers: authHeaders(token, false) }); if (!res.ok) throw new Error("listArtifacts failed"); return await res.json(); }
-export async function updateRetention(token, artifactId, payload) { const res = await fetch(`${API}/artifacts/${artifactId}/retention`, { method: "POST", headers: authHeaders(token), body: JSON.stringify(payload) }); if (!res.ok) throw new Error("updateRetention failed"); return await res.json(); }
-export async function exportKnowledge(token, learnerId, packId, payload) { const res = await fetch(`${API}/learners/${learnerId}/knowledge-export/${packId}`, { method: "POST", headers: authHeaders(token), body: JSON.stringify(payload) }); if (!res.ok) throw new Error("exportKnowledge failed"); return await res.json(); }
diff --git a/webui/src/styles.css b/webui/src/styles.css
index e2085a0..df0b5ce 100644
--- a/webui/src/styles.css
+++ b/webui/src/styles.css
@@ -1,23 +1,24 @@
 :root {
-  --bg:#f6f8fb; --card:#ffffff; --text:#1f2430; --muted:#60697a; --border:#dbe1ea; --accent:#2d6cdf;
+  --bg:#f6f8fb; --card:#ffffff; --text:#1f2430; --muted:#5f6b7a; --border:#dbe1ea; --accent:#2d6cdf;
 }
 * { box-sizing:border-box; }
-body { margin:0; font-family:Arial, Helvetica, sans-serif; background:var(--bg); color:var(--text); }
-.page { max-width:1600px; margin:0 auto; padding:24px; }
-.narrow-page { max-width:520px; }
-.hero { background:var(--card); border:1px solid var(--border); border-radius:22px; padding:24px; display:flex; justify-content:space-between; gap:16px; align-items:flex-start; }
-.controls { display:flex; gap:10px; align-items:flex-end; flex-wrap:wrap; }
-label { display:block; font-weight:600; }
-input, select { width:100%; margin-top:6px; border:1px solid var(--border); border-radius:10px; padding:10px; font:inherit; background:white; }
-button { border:1px solid var(--border); background:white; border-radius:12px; padding:10px 14px; cursor:pointer; }
-.card { background:var(--card); border:1px solid var(--border); border-radius:18px; padding:18px; }
-.narrow { margin-top:60px; }
-.layout { display:grid; gap:16px; }
-.threecol { grid-template-columns:1fr 1fr 1fr; }
-.prebox { background:#f7f8fa; border:1px solid var(--border); border-radius:12px; padding:12px; overflow:auto; max-height:460px; }
+body { margin:0; background:var(--bg); color:var(--text); font-family:Arial, Helvetica, sans-serif; }
+.page { max-width:1700px; margin:0 auto; padding:24px; }
+.narrow { max-width:520px; }
+.hero, .card { background:var(--card); border:1px solid var(--border); border-radius:18px; padding:18px; }
+.hero { display:flex; justify-content:space-between; gap:16px; margin-bottom:18px; }
+.grid3 { display:grid; grid-template-columns:1fr 1.2fr 1fr; gap:18px; }
+.stack { display:grid; gap:14px; }
+.card.small h3 { margin-top:0; }
+label { display:block; font-weight:600; margin-bottom:10px; }
+input { width:100%; margin-top:6px; border:1px solid var(--border); border-radius:10px; padding:10px; font:inherit; background:white; }
+button { border:1px solid var(--border); background:white; border-radius:12px; padding:10px 12px; cursor:pointer; margin-right:8px; margin-top:8px; }
+button.primary { background:var(--accent); color:white; border-color:var(--accent); }
+.toolbar { display:flex; gap:8px; align-items:flex-start; flex-wrap:wrap; }
 .muted { color:var(--muted); }
+pre { white-space:pre-wrap; word-break:break-word; font-size:12px; margin:0; }
 .error { color:#b42318; margin-top:10px; }
-@media (max-width:1200px) {
+@media (max-width: 1350px) {
+  .grid3 { grid-template-columns:1fr; }
   .hero { flex-direction:column; }
-  .threecol { grid-template-columns:1fr; }
 }