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/token_event.py

@@ -27,8 +27,8 @@ class TokenEvent(Base):
     task_id: Mapped[uuid.UUID | None] = mapped_column(
         UUID(as_uuid=True), ForeignKey("tasks.id", ondelete="SET NULL"), nullable=True, index=True
     )
-    workstream_id: Mapped[uuid.UUID | None] = mapped_column(
-        UUID(as_uuid=True), ForeignKey("workstreams.id", ondelete="SET NULL"), nullable=True, index=True
+    workplan_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("workplans.id", ondelete="SET NULL"), nullable=True, index=True
     )
     repo_id: Mapped[uuid.UUID | None] = mapped_column(
         UUID(as_uuid=True), ForeignKey("managed_repos.id", ondelete="SET NULL"), nullable=True, index=True
@@ -75,5 +75,5 @@ class TokenEvent(Base):
     )
 
     task: Mapped["Task | None"] = relationship("Task", lazy="selectin")  # noqa: F821
-    workstream: Mapped["Workstream | None"] = relationship("Workstream", lazy="selectin")  # noqa: F821
+    workplan: Mapped["Workplan | None"] = relationship("Workplan", lazy="selectin")  # noqa: F821
     repo: Mapped["ManagedRepo | None"] = relationship("ManagedRepo", lazy="selectin")  # noqa: F821