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/services/workplan_files.py

@@ -41,9 +41,9 @@ def resolve_repo_path(repo: ManagedRepo | None) -> Path | None:
     return None
 
 
-def find_workplan_for_workstream(
+def find_workplan_for_workplan(
     repo: ManagedRepo | None,
-    workstream_id: uuid.UUID,
+    workplan_id: uuid.UUID,
 ) -> WorkplanFileRef | None:
     repo_path = resolve_repo_path(repo)
     if repo_path is None:
@@ -57,11 +57,15 @@ def find_workplan_for_workstream(
             continue
         for path in sorted(directory.glob("*.md")):
             meta = _frontmatter(path)
-            if str(meta.get("state_hub_workstream_id", "")).strip().strip('"') == str(workstream_id):
+            file_id = meta.get("state_hub_workplan_id") or meta.get("state_hub_workstream_id")
+            if str(file_id or "").strip().strip('"') == str(workplan_id):
                 return WorkplanFileRef(repo_path=repo_path, path=path, archived=archived)
     return None
 
 
+find_workplan_for_workstream = find_workplan_for_workplan
+
+
 def task_block_linked(path: Path, task_id: uuid.UUID) -> bool:
     return _task_block_for_task(path, task_id) is not None