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.py

@@ -0,0 +1,70 @@
+import uuid
+from datetime import date, datetime
+
+from sqlalchemy import Date, DateTime, ForeignKey, Integer, String, Text
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from api.models.base import Base, TimestampMixin, new_uuid
+
+
+class Workplan(Base, TimestampMixin):
+    __tablename__ = "workplans"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=new_uuid
+    )
+    topic_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("topics.id", ondelete="RESTRICT"), nullable=True, index=True
+    )
+    slug: Mapped[str] = mapped_column(String(100), unique=True, nullable=False, index=True)
+    title: Mapped[str] = mapped_column(String(255), nullable=False)
+    description: Mapped[str | None] = mapped_column(Text, nullable=True)
+    status: Mapped[str] = mapped_column(
+        String(20), nullable=False, default="active", server_default="active"
+    )
+    owner: Mapped[str | None] = mapped_column(String(100), nullable=True)
+    due_date: Mapped[date | None] = mapped_column(Date, nullable=True)
+    planning_priority: Mapped[str | None] = mapped_column(String(20), nullable=True, index=True)
+    planning_order: Mapped[int | None] = mapped_column(Integer, nullable=True, index=True)
+    execution_state: Mapped[str] = mapped_column(
+        String(20), nullable=False, default="manual", server_default="manual", index=True
+    )
+    launch_mode: Mapped[str] = mapped_column(
+        String(20), nullable=False, default="manual", server_default="manual", index=True
+    )
+    concurrency_mode: Mapped[str] = mapped_column(
+        String(20), nullable=False, default="sequential", server_default="sequential", index=True
+    )
+    queue_rank: Mapped[int | None] = mapped_column(Integer, nullable=True, index=True)
+    execution_group: Mapped[str | None] = mapped_column(String(100), nullable=True, index=True)
+    scheduled_for: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
+
+    repo_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True),
+        ForeignKey("managed_repos.id", ondelete="RESTRICT"),
+        nullable=False,
+        index=True,
+    )
+    repo_goal_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True),
+        ForeignKey("repo_goals.id", ondelete="SET NULL"),
+        nullable=True,
+        index=True,
+    )
+
+    topic: Mapped["Topic | None"] = relationship("Topic", back_populates="workplans")  # noqa: F821
+    repo: Mapped["ManagedRepo"] = relationship("ManagedRepo", lazy="selectin")  # noqa: F821
+    repo_goal: Mapped["RepoGoal"] = relationship("RepoGoal", back_populates="workplans", lazy="selectin")  # noqa: F821
+    tasks: Mapped[list["Task"]] = relationship(  # noqa: F821
+        "Task", back_populates="workplan", lazy="selectin"
+    )
+    decisions: Mapped[list["Decision"]] = relationship(  # noqa: F821
+        "Decision", back_populates="workplan", lazy="selectin"
+    )
+    progress_events: Mapped[list["ProgressEvent"]] = relationship(  # noqa: F821
+        "ProgressEvent", back_populates="workplan", lazy="selectin"
+    )
+    launch_requests: Mapped[list["WorkplanLaunchRequest"]] = relationship(  # noqa: F821
+        "WorkplanLaunchRequest", back_populates="workplan", lazy="selectin"
+    )