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/models/__init__.py

@@ -4,6 +4,8 @@ from api.models.domain_goal import DomainGoal, DomainGoalStatus
 from api.models.topic import Topic, TopicStatus
 from api.models.managed_repo import ManagedRepo
 from api.models.repo_goal import RepoGoal, RepoGoalStatus
+from api.models.workplan import Workplan
+from api.models.workplan_dependency import WorkplanDependency
 from api.models.workstream import Workstream
 from api.models.workstream_dependency import WorkstreamDependency
 from api.models.task import Task, TaskStatus, TaskPriority
@@ -39,6 +41,8 @@ __all__ = [
     "Topic", "TopicStatus",
     "ManagedRepo",
     "RepoGoal", "RepoGoalStatus",
+    "Workplan",
+    "WorkplanDependency",
     "Workstream",
     "WorkstreamDependency",
     "Task", "TaskStatus", "TaskPriority",
@@ -61,4 +65,4 @@ __all__ = [
     "WorkplanLaunchRequest",
     "FabricGraphImport", "FabricGraphNode", "FabricGraphEdge",
     "LegacyInterface", "LegacyInterfaceUsageBucket",
-]
+]