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gsxdsm 4dab2b6986 FN-7011: Exclude engine downtime from task timing

Exclude proven engine-process downtime from active task duration stats and badges.

- Persist a throttled engineLastActiveAt heartbeat while the scheduler is running and unpaused.
- Reconcile in-progress execution segment anchors on startup when downtime exceeds the poll threshold.
- Emit run-audit events for shifted and no-action downtime reconciliation outcomes.
- Cover core timing, dashboard badge behavior, scheduler heartbeat throttling, and self-healing audit metadata.
- Add a patch changeset for the published CLI package.

Files changed:
 .changeset/fn-7011-engine-downtime-timing.md       |  7 +++
 AGENTS.md                                          |  1 +
 .../src/__tests__/store-execution-timing.test.ts   | 51 ++++++++++++++++++++++
 packages/core/src/settings-schema.ts               |  1 +
 packages/core/src/store.ts                         | 28 ++++++++++++
 packages/core/src/types.ts                         |  5 +++
 .../app/utils/__tests__/taskTiming.test.ts         | 16 +++++++
 .../__tests__/scheduler-workflow-cutover.test.ts   | 29 +++++++++++-
 packages/engine/src/__tests__/self-healing.test.ts | 23 ++++++++++
 packages/engine/src/run-audit.ts                   |  4 ++
 packages/engine/src/scheduler.ts                   | 11 +++++
 packages/engine/src/self-healing.ts                | 21 +++++++++
 12 files changed, 196 insertions(+), 1 deletion(-)

Fusion-Task-Id: FN-7011

Fusion-Task-Lineage: 44225b0a-0fa1-40be-812d-33fd5e446944

2026-06-25 23:35:31 -07:00