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gsxdsm 39b2478f01 FN-6227: handle non-empty worktree removals

Recover native worktree cleanup when git refuses to remove a non-empty worktree.

- Detect recoverable git worktree remove errors and fall back to filesystem removal plus admin pruning.
- Add a worktree remove fallback audit event for recovery visibility.
- Cover non-empty removal recovery with unit and real-git regression tests.
- Keep flaky-test quarantine exclusions merged with current main.

Files changed:
 docs/architecture.md                               |   4 +-
 ...tree-remove-non-empty-recovery.real-git.test.ts | 139 +++++++++++++++++++++
 .../engine/src/__tests__/worktree-backend.test.ts  | 113 ++++++++++++++++-
 packages/engine/src/run-audit.ts                   |   1 +
 packages/engine/src/worktree-backend.ts            |  57 ++++++++-
 packages/engine/vitest.config.ts                   |   1 +
 scripts/lib/test-quarantine.json                   |   5 +
 7 files changed, 311 insertions(+), 9 deletions(-)

Fusion-Task-Id: FN-6227

Fusion-Task-Lineage: 98673303-8109-4fe8-8d9f-eb867fb28bdd

2026-06-11 16:15:07 -07:00