test: verify-strict 'dlqs envelope without outer signature' flakes on a file watch after the DLQ move #720

plugins/openclaw-tps-mail/test/verify-strict.test.ts > "dlqs envelope without outer signature" failed once in CI and passed on a re-run of the same commit (run 41763725690, job "Unit & Integration Tests", 2026-11-04). The failure line was preceded by error: ENOENT: no such file or directory, watch '<tmp>/anvil/new/2026-05-26T00-00-00-msg-….json': an fs.watch on a single message FILE that had already been moved out of new/.

The plugin's ingestion watches the new/ directory (src/index.ts ~2363), not files, so the file-level watch comes from somewhere else (a test helper, a mock, or a watcher leaking from an earlier test in the file).

What the fix does:

• Finds the caller that watches the message file and removes the race: the test waits for the DLQ write deterministically (poll for the reason file with a bounded timeout) instead of a fixed 2 s race, and nothing watches a path the code under test moves.
• Every watcher the file creates is closed in afterEach.

Test: run the file 50 times in a loop on CI's Bun; zero failures.