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gsxdsm 94c3cce7bc FN-6257: make AI merge cleanup idempotent for absent worktrees

AI merge cleanup now tolerates already-removed worktrees without failing a landed merge.

- Treat ENOENT and de-registered worktree removal errors as successful idempotent cleanup.
- Register AI merge temp paths before worktree creation and keep raw/canonical paths active.
- Add cleanup regression coverage and include the cleanup suite in reliability tests.
- Document the idempotent cleanup telemetry contract.

Files changed:
 docs/architecture.md                               |   2 +-
 .../engine/src/__tests__/merger-ai-cleanup.test.ts |  48 +++++++-
 .../ai-merge-cleanup-enoent-idempotent.test.ts     | 128 +++++++++++++++++++++
 packages/engine/src/merger-ai.ts                   |  73 +++++++++---
 packages/engine/vitest.config.ts                   |   5 +-
 5 files changed, 239 insertions(+), 17 deletions(-)

Fusion-Task-Id: FN-6257

Fusion-Task-Lineage: c669fa1e-2c92-4e2f-8726-4939a3146955

2026-06-11 18:14:45 -07:00