FN-5695: sync feature assertions for late-added mission features

Close the assertion-graph gap by making mission feature assertions store-managed and automatically synchronized.

- add `sourceFeatureId` to contract assertions (types, schema migration, persistence, snapshot restore)
- auto-create/update/delete managed assertions when features are added, edited, or removed in `MissionStore`
- remove duplicate/manual assertion creation from mission routes and rely on centralized store behavior
- expand core, dashboard, engine, and plugin tests plus docs to cover validator behavior for later-added features

Files changed:
 docs/missions.md                                   | 11 ++-
 docs/storage.md                                    |  2 +-
 packages/core/src/__tests__/db-migrate.test.ts     | 12 ++--
 packages/core/src/__tests__/db.test.ts             | 34 ++++-----
 packages/core/src/__tests__/goals-schema.test.ts   |  2 +-
 packages/core/src/__tests__/insight-store.test.ts  | 10 +--
 packages/core/src/__tests__/mission-store.test.ts  | 82 +++++++++++++++++++---
 packages/core/src/__tests__/run-audit.test.ts      |  2 +-
 packages/core/src/__tests__/secrets-schema.test.ts |  6 +-
 .../core/src/__tests__/store-merge-queue.test.ts   |  2 +-
 packages/core/src/__tests__/task-documents.test.ts |  2 +-
 packages/core/src/db.ts                            | 11 ++-
 packages/core/src/mission-store.ts                 | 69 ++++++++++++++++--
 packages/core/src/mission-types.ts                 |  4 ++
 .../dashboard/src/__tests__/mission-e2e.test.ts    | 70 ++++++++++++------
 packages/dashboard/src/mission-routes.ts           | 16 +----
 .../src/__tests__/mission-execution-loop.test.ts   | 46 +++++++++++-
 .../src/store/__tests__/roadmap-store.test.ts      |  4 +-
 18 files changed, 288 insertions(+), 97 deletions(-)

Fusion-Task-Id: FN-5695
Fusion-Task-Lineage: 337f030c-e883-41aa-b982-13ebe45bd5ee

plugins/fusion-plugin-roadmap/src/store/__tests__/roadmap-store.test.ts

@@ -743,8 +743,8 @@ describe("RoadmapStore", () => {
   });
 
   describe("schema version", () => {
-    it("schema version is 96 after init", () => {
-      expect(db.getSchemaVersion()).toBe(96);
+    it("schema version is 97 after init", () => {
+      expect(db.getSchemaVersion()).toBe(97);
     });
   });