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/technical_debt.py

@@ -76,13 +76,13 @@ class TechnicalDebt(Base, TimestampMixin):
     topic_id: Mapped[uuid.UUID | None] = mapped_column(
         UUID(as_uuid=True), ForeignKey("topics.id", ondelete="SET NULL"), nullable=True
     )
-    workstream_id: Mapped[uuid.UUID | None] = mapped_column(
-        UUID(as_uuid=True), ForeignKey("workstreams.id", ondelete="SET NULL"), nullable=True
+    workplan_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("workplans.id", ondelete="SET NULL"), nullable=True
     )
 
     domain: Mapped["Domain"] = relationship("Domain", lazy="selectin")  # noqa: F821
     topic: Mapped["Topic"] = relationship("Topic", lazy="selectin")  # noqa: F821
-    workstream: Mapped["Workstream"] = relationship("Workstream", lazy="selectin")  # noqa: F821
+    workplan: Mapped["Workplan"] = relationship("Workplan", lazy="selectin")  # noqa: F821
     notes: Mapped[list["TDNote"]] = relationship(
         "TDNote", back_populates="td", lazy="selectin",
         order_by="TDNote.created_at",