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gsxdsm 3e69d3990d FN-6244: protect active AI merge worktrees

Ensure AI merge cleanup only reaps stale, inactive temp worktrees.

- Register live AI merge clean-room paths in the active session registry while merges run.
- Add a minimum temp-worktree reap age and conservative lookup-error handling to sweep and prune paths.
- Expand cleanup tests and release the repaired AI merge cleanup test from quarantine.

Files changed:
 docs/architecture.md                               |  2 +-
 .../engine/src/__tests__/merger-ai-cleanup.test.ts | 38 ++++++++++++++--
 .../__tests__/self-healing-tempdir-sweep.test.ts   | 52 +++++++++++++++++++---
 packages/engine/src/active-session-registry.ts     |  2 +-
 packages/engine/src/merger-ai.ts                   | 29 +++++++++++-
 packages/engine/src/self-healing.ts                | 28 +++++++++---
 packages/engine/vitest.config.ts                   |  1 -
 scripts/lib/test-quarantine.json                   |  5 ---
 8 files changed, 132 insertions(+), 25 deletions(-)

Fusion-Task-Id: FN-6244

Fusion-Task-Lineage: 5c8ced12-d38f-4e45-9ea0-119b3236a2cb

2026-06-11 15:54:49 -07:00