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__/step-session-executor.test.ts

@@ -566,7 +566,7 @@ vi.mock("../logger.js", () => {
     createLogger: vi.fn((prefix: string) => getLogger(prefix)),
     schedulerLog: getLogger("scheduler"),
     executorLog: getLogger("executor"),
-    triageLog: getLogger("triage"),
+    planLog: getLogger("plan"),
     mergerLog: getLogger("merger"),
     worktreePoolLog: getLogger("worktree-pool"),
     reviewerLog: getLogger("reviewer"),