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/domains.py

@@ -8,7 +8,7 @@ from api.models.extension_point import ExtensionPoint
 from api.models.managed_repo import ManagedRepo
 from api.models.technical_debt import TechnicalDebt
 from api.models.topic import Topic
-from api.models.workstream import Workstream
+from api.models.workplan import Workplan
 from api.schemas.domain import (
     DomainCreate,
     DomainDetail,
@@ -32,9 +32,9 @@ async def _build_domain_detail(domain: Domain, session: AsyncSession) -> DomainD
     workstream_count = 0
     if topic_ids:
         workstream_count_row = await session.execute(
-            select(func.count()).select_from(Workstream)
-            .where(Workstream.topic_id.in_(topic_ids))
-            .where(Workstream.status == "active")
+            select(func.count()).select_from(Workplan)
+            .where(Workplan.topic_id.in_(topic_ids))
+            .where(Workplan.status == "active")
         )
         workstream_count = workstream_count_row.scalar_one()