feat(FN-3280): harden reviewState persistence, API, and PR feedback sync

Merges reviewState hardening (FN-3280 steps 2-3: hardened persistence, API fixes, and PR feedback sync), stepIndex reconciliation for task updates (FN-3757), roadmap route context extraction into the fusion-plugin-roadmap plugin (FN-3160), and shared state snapshots for mesh sync with autostash hard

Fusion-Task-Id: FN-3280

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

@@ -742,7 +742,7 @@ describe("RoadmapStore", () => {
 
   describe("schema version", () => {
     it("schema version is 40 after init", () => {
-      expect(db.getSchemaVersion()).toBe(68);
+      expect(db.getSchemaVersion()).toBe(69);
     });
   });