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

packages/core/src/db.ts

@@ -88,7 +88,7 @@ export function probeFts5(db: DatabaseSync): boolean {
 
 // ── Schema Definition ────────────────────────────────────────────────
 
-const SCHEMA_VERSION = 68;
+const SCHEMA_VERSION = 69;
 
 function normalizeTaskComments(
   steeringComments: SteeringComment[] | undefined,
@@ -202,6 +202,7 @@ CREATE TABLE IF NOT EXISTS tasks (
   steeringComments TEXT DEFAULT '[]',
   comments TEXT DEFAULT '[]',
   review TEXT,
+  reviewState TEXT,
   workflowStepResults TEXT DEFAULT '[]',
   prInfo TEXT,
   issueInfo TEXT,
@@ -2629,6 +2630,12 @@ export class Database {
       });
     }
 
+    if (version < 69) {
+      this.applyMigration(69, () => {
+        this.addColumnIfMissing("tasks", "reviewState", "TEXT");
+      });
+    }
+
   }
 
   /**