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/schemas/workstream_dependency.py

@@ -1,36 +1,19 @@
-import uuid
-from datetime import datetime
+"""Legacy aliases — prefer ``api.schemas.workplan_dependency``."""
+from api.schemas.workplan_dependency import (
+    WorkplanDepStub,
+    WorkplanDependencyCreate,
+    WorkplanDependencyRead,
+)
 
-from pydantic import BaseModel, ConfigDict
+WorkstreamDependencyCreate = WorkplanDependencyCreate
+WorkstreamDependencyRead = WorkplanDependencyRead
+WorkstreamDepStub = WorkplanDepStub
 
-
-class WorkstreamDependencyCreate(BaseModel):
-    to_workstream_id: uuid.UUID | None = None
-    to_task_id: uuid.UUID | None = None
-    relationship_type: str = "blocks"
-    description: str | None = None
-
-
-class WorkstreamDependencyRead(BaseModel):
-    model_config = ConfigDict(from_attributes=True)
-    id: uuid.UUID
-    from_workstream_id: uuid.UUID
-    to_workstream_id: uuid.UUID | None = None
-    to_task_id: uuid.UUID | None = None
-    relationship_type: str
-    description: str | None = None
-    created_at: datetime
-    updated_at: datetime
-
-
-class WorkstreamDepStub(BaseModel):
-    """Minimal projection of the other end of a dependency edge."""
-    dep_id: uuid.UUID
-    target_type: str = "workstream"
-    relationship_type: str = "blocks"
-    workstream_id: uuid.UUID | None = None
-    workstream_slug: str | None = None
-    workstream_title: str | None = None
-    task_id: uuid.UUID | None = None
-    task_title: str | None = None
-    description: str | None = None
+__all__ = [
+    "WorkstreamDependencyCreate",
+    "WorkstreamDependencyRead",
+    "WorkstreamDepStub",
+    "WorkplanDependencyCreate",
+    "WorkplanDependencyRead",
+    "WorkplanDepStub",
+]