FN-8677: propagate task update lanes before conversion

Propagate cache-warmed workflow lanes through task updates so synchronous engine consumers support renamed boards.

- Add task lane cache and attach resolved lanes to task:updated metadata.
- Update scheduler, triage, and notification consumers to use carried lanes with bridge-safe fallbacks.
- Cover lane propagation and renamed-lane event behavior with core and engine tests.

Files changed:
 .changeset/fn-8677-manual-merge-hold-lanes.md      |   7 ++
 .changeset/task-updated-carries-lanes.md           |   7 ++
 ...orkflow-ir-readers-always-return-the-default.md |  22 +++++
 .../sync-workflow-ir-second-blocker.test.ts        |  43 +++-----
 .../core/src/__tests__/task-lane-cache.test.ts     |  30 ++++++
 .../task-updated-lanes-emit-surfaces.test.ts       |  92 ++++++++++++++++++
 .../__tests__/task-updated-lanes-payload.test.ts   |  42 ++++++++
 packages/core/src/index.ts                         |   1 +
 packages/core/src/store.ts                         |  36 ++++++-
 packages/core/src/task-lane-cache.ts               |  63 ++++++++++++
 .../core/src/task-store/archive-lifecycle-2.ts     |   3 +
 packages/core/src/task-store/moves.ts              |   1 +
 packages/core/src/task-store/task-artifacts-ops.ts |   1 +
 packages/core/src/task-store/task-update.ts        |   1 +
 packages/core/src/task-store/update-task-deps.ts   |   4 +-
 .../core/src/task-store/workflow-definitions.ts    |  71 +++++---------
 .../__tests__/scheduler-task-updated-lanes.test.ts | 108 +++++++++++++++++++++
 .../task-updated-lanes-bridge-compat.test.ts       |  94 ++++++++++++++++++
 ...task-updated-lanes-engine-emit-surfaces.test.ts | 101 +++++++++++++++++++
 .../src/__tests__/triage-pause-abort.test.ts       |  22 +++++
 .../src/__tests__/triage-planning-wake.test.ts     |  25 +++++
 .../notification-renamed-lifecycle-columns.test.ts |  84 +++++++++++++++-
 .../__tests__/task-wedge-notification.test.ts      |  19 ++++
 .../src/notification/notification-service.ts       |  56 ++++-------
 packages/engine/src/scheduler.ts                   |  62 +++---------
 packages/engine/src/triage.ts                      | 105 ++++++--------------
 scripts/lib/inert-sync-lane-baseline.json          |   5 +-
 27 files changed, 858 insertions(+), 247 deletions(-)

Fusion-Task-Id: FN-8677

Fusion-Task-Lineage: d8fef9db-0f88-4dfd-9813-be25e10e3588

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

scripts/lib/inert-sync-lane-baseline.json

@@ -1,7 +1,6 @@
 {
-  "total": 6,
+  "total": 2,
   "byFile": {
-    "packages/engine/src/executor.ts": 2,
-    "packages/engine/src/triage.ts": 4
+    "packages/engine/src/executor.ts": 2
   }
 }