Same class of failure as the kb-db-test-* leak: vitest's forks pool
SIGTERMs a fork on test timeout and skips the in-test `finally { rmSync }`,
leaking `fusion-test-ref-project-*`, `fusion-test-ref-concurrent-project-*`,
and `fusion-test-ref-advance-*` dirs that scripts/check-test-isolation.mjs
flags during deterministic merge verification.
Track every minted dir in a per-file set and sweep it from
SIGTERM/SIGINT/SIGHUP/beforeExit/exit handlers (signals re-raised after
cleanup) plus an `afterAll` for the happy path.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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