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/capability_request.py

@@ -31,9 +31,9 @@ class CapabilityRequest(Base, TimestampMixin):
         nullable=False,
         index=True,
     )
-    requesting_workstream_id: Mapped[uuid.UUID | None] = mapped_column(
+    requesting_workplan_id: Mapped[uuid.UUID | None] = mapped_column(
         UUID(as_uuid=True),
-        ForeignKey("workstreams.id", ondelete="SET NULL"),
+        ForeignKey("workplans.id", ondelete="SET NULL"),
         nullable=True,
     )
     requesting_agent: Mapped[str] = mapped_column(String(100), nullable=False)
@@ -45,9 +45,9 @@ class CapabilityRequest(Base, TimestampMixin):
         nullable=True,
         index=True,
     )
-    fulfilling_workstream_id: Mapped[uuid.UUID | None] = mapped_column(
+    fulfilling_workplan_id: Mapped[uuid.UUID | None] = mapped_column(
         UUID(as_uuid=True),
-        ForeignKey("workstreams.id", ondelete="SET NULL"),
+        ForeignKey("workplans.id", ondelete="SET NULL"),
         nullable=True,
     )
     fulfilling_agent: Mapped[str | None] = mapped_column(String(100), nullable=True)