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gsxdsm 21cb8abcf3 FN-6310: recreate temp redirect sink after cleanup

Recreate Vitest tmpdir redirect sinks on demand after recovery cleanup removes them.

- Ensure cached tmpdir redirect sinks are recreated before later mkdtemp calls.
- Preserve live/current redirect sinks when sweeping stale pid-owned sinks.
- Add regression coverage for sync/async mkdtemp recovery and stale sink sweeping.

Files changed:
 packages/core/src/__test-utils__/vitest-setup.ts   | 21 ++++++-
 .../__tests__/vitest-setup-tmp-redirect.test.ts    | 66 +++++++++++++++++++++-
 2 files changed, 85 insertions(+), 2 deletions(-)

Fusion-Task-Id: FN-6310

Fusion-Task-Lineage: 311cb7f6-9c7b-4e4d-9235-e787382dcc3a

2026-06-12 17:21:14 -07:00