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gsxdsm cc793987b2 FN-6596: guard compound engineering debug launches

Guard Compound Engineering debug stage launches against stale stage settings and artifacts.

- Add source-level coverage proving stale enabledStages snapshots do not block registered CE stages, including debug.
- Add dist freshness checks for the disabledStages opt-out launch model so stale compiled plugin artifacts fail fast.
- Mirror newly observed core suite-load flakes in the quarantine ledger and Vitest excludes.

Files changed:
 packages/core/vitest.config.ts                     |  5 ++
 .../src/__tests__/dist-freshness.test.ts           | 38 +++++++++++++++
 .../src/__tests__/stage-launch-guard.test.ts       | 57 ++++++++++++++++++++++
 scripts/lib/test-quarantine.json                   | 10 ++++
 4 files changed, 110 insertions(+)

Fusion-Task-Id: FN-6596

Fusion-Task-Lineage: 3cd75e5f-c6f8-4bde-8202-54eeac82b894

2026-06-17 17:21:22 -07:00