feat(FN-5226): add scope auto-widen layer 2.5 to merger for attribution-bas

Merges the Layer 2.5 scope-auto-widen feature (FN-5226) into the merger: a new evaluator module that automatically widens a task's declared file scope based on git attribution prior to the existing scope partition gate, wired into `merger.ts` with full audit taxonomy, persisted task metadata, and re

Fusion-Task-Id: FN-5226

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

@@ -743,8 +743,8 @@ describe("RoadmapStore", () => {
   });
 
   describe("schema version", () => {
-    it("schema version is 89 after init", () => {
-      expect(db.getSchemaVersion()).toBe(89);
+    it("schema version is 90 after init", () => {
+      expect(db.getSchemaVersion()).toBe(90);
     });
   });