feat(classification-spine): implement STATE-WP-0065 repo-anchored model

Replace the ad-hoc coordination-domain spine with the Repo Classification
Standard: 14 market domains, classification columns on managed_repos, and
workplans anchored by repo_id (topic_id optional).

- Add Alembic migration d8e9f0a1b2c3 with data backfill and workstream→workplan rename
- Add api/classification.py validation and register-from-classification tooling
- Expose workplan-first REST/MCP surface with legacy workstream aliases
- Add C-24 consistency rule and legacy domain frontmatter mapping
- Update dashboard repos page with category/capability/stake filters
- Update orientation docs; mark STATE-WP-0065 finished

api/routers/capability_requests.py

@@ -68,7 +68,7 @@ async def create_request(
         priority=body.priority,
         requesting_domain_id=req_domain.id,
         requesting_agent=body.requesting_agent,
-        requesting_workstream_id=body.requesting_workstream_id,
+        requesting_workplan_id=body.requesting_workplan_id,
         blocking_task_id=body.blocking_task_id,
         fulfilling_domain_id=fulfilling_domain_id,
         catalog_entry_id=catalog_entry_id,
@@ -115,7 +115,7 @@ async def accept_request(
     now = datetime.now(tz=timezone.utc)
     req.status = "accepted"
     req.fulfilling_agent = body.fulfilling_agent
-    req.fulfilling_workstream_id = body.fulfilling_workstream_id
+    req.fulfilling_workplan_id = body.fulfilling_workplan_id
     req.accepted_at = now
 
     # If no fulfilling domain was set by routing, infer from the accepting agent's context
@@ -212,7 +212,7 @@ async def patch_request(
     session: AsyncSession = Depends(get_session),
 ) -> CapabilityRequest:
     """Correct mutable metadata: catalog_entry_id (re-derives fulfilling domain),
-    priority, blocking_task_id, fulfilling_workstream_id.
+    priority, blocking_task_id, fulfilling_workplan_id.
     Only fields present in the request body (non-None) are updated.
     """
     req = await _get_request_or_404(request_id, session)
@@ -241,9 +241,9 @@ async def patch_request(
         req.blocking_task_id = body.blocking_task_id
         corrections.append(f"blocking_task_id → {body.blocking_task_id}")
 
-    if body.fulfilling_workstream_id is not None:
-        req.fulfilling_workstream_id = body.fulfilling_workstream_id
-        corrections.append(f"fulfilling_workstream_id → {body.fulfilling_workstream_id}")
+    if body.fulfilling_workplan_id is not None:
+        req.fulfilling_workplan_id = body.fulfilling_workplan_id
+        corrections.append(f"fulfilling_workplan_id → {body.fulfilling_workplan_id}")
 
     if not corrections:
         return req  # no-op