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gsxdsm 10972bbdce FN-6360: clean up leaked test worker temp roots

Ensure test isolation removes stale worker temp roots after interrupted or busy Vitest runs.

- Add bounded retry cleanup for Vitest worker roots during teardown.
- Prune orphaned fusion-test-workers-* directories before changed-test isolation checks.
- Cover worker-root retry and pruning behavior with targeted tests.

Files changed:
 .../core/src/__test-utils__/vitest-teardown.ts     | 50 ++++++++++--
 .../vitest-teardown-worker-root-cleanup.test.ts    | 88 ++++++++++++++++++++++
 scripts/__tests__/test-changed.test.mjs            | 33 ++++++++
 scripts/test-changed.mjs                           | 32 ++++++++
 4 files changed, 196 insertions(+), 7 deletions(-)

Fusion-Task-Id: FN-6360

Fusion-Task-Lineage: d537941d-dd58-403a-a82e-f0aeee9c1eb0

2026-06-13 08:11:46 -07:00