feat(FN-2603): merge fusion/fn-2603 (auto-resolved)

- test(FN-2603): update downstream tests for planning label expectations
- test(FN-2603): complete Step 6 — update engine tests for planning terminology
- feat(FN-2603): complete Step 5 — rename self-healing planning APIs
- feat(FN-2603): complete Step 4 — rename needs-respecify status to needs-replan
- feat(FN-2603): complete Step 3 — rename specifying and re-specification text
- feat(FN-2603): complete Step 2 — rename triageLog usages to planLog
- feat(FN-2603): complete Step 1 — rename triage logger to plan logger
- feat(FN-2602): complete Step 7 — add release changeset
- test(FN-2602): complete Step 6 — align migration and schema tests
- test(FN-2602): complete Step 5 — update store status assertions
- feat(FN-2602): complete Step 4 — rename triage prompt labels
- feat(FN-2602): complete Step 3 — add status rename migration
- feat(FN-2602): complete Step 2 — rename respecify status literals
- feat(FN-2602): complete Step 1 — rename triage display labels

packages/engine/src/__tests__/restart.integration.test.ts

@@ -830,8 +830,8 @@ describe("Triage re-pick after restart", () => {
     triage.stop();
 
     // Both triage tasks should have been picked up for specification
-    expect(store.updateTask).toHaveBeenCalledWith("FN-060", { status: "specifying" });
-    expect(store.updateTask).toHaveBeenCalledWith("FN-061", { status: "specifying" });
+    expect(store.updateTask).toHaveBeenCalledWith("FN-060", { status: "planning" });
+    expect(store.updateTask).toHaveBeenCalledWith("FN-061", { status: "planning" });
     expect(mockedCreateFnAgent).toHaveBeenCalledTimes(2);
   });
 
@@ -960,7 +960,7 @@ describe("Scheduler after restart", () => {
     await new Promise((r) => setTimeout(r, 100));
     triage.stop();
 
-    expect(store.updateTask).toHaveBeenCalledWith("FN-080", { status: "specifying" });
+    expect(store.updateTask).toHaveBeenCalledWith("FN-080", { status: "planning" });
 
     // 2. Scheduler moves todo → in-progress
     vi.clearAllMocks();