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/workplan_launch_request.py

@@ -13,9 +13,9 @@ class WorkplanLaunchRequest(Base, TimestampMixin):
     id: Mapped[uuid.UUID] = mapped_column(
         UUID(as_uuid=True), primary_key=True, default=new_uuid
     )
-    workstream_id: Mapped[uuid.UUID] = mapped_column(
+    workplan_id: Mapped[uuid.UUID] = mapped_column(
         UUID(as_uuid=True),
-        ForeignKey("workstreams.id", ondelete="CASCADE"),
+        ForeignKey("workplans.id", ondelete="CASCADE"),
         nullable=False,
         index=True,
     )
@@ -36,4 +36,4 @@ class WorkplanLaunchRequest(Base, TimestampMixin):
     notes: Mapped[str | None] = mapped_column(Text, nullable=True)
     request_metadata: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict, server_default="{}")
 
-    workstream: Mapped["Workstream"] = relationship("Workstream", back_populates="launch_requests")  # noqa: F821
+    workplan: Mapped["Workplan"] = relationship("Workplan", back_populates="launch_requests")  # noqa: F821