[T-Crypt]

CI on main is red, and two tests cause it.

1. TestParkedEngineReattachesParked: a record left behind

Run 40968557417 failed after the v0.4.0 merge. The test passed, then its temp dir cleanup failed with this error:

TempDir RemoveAll cleanup: unlinkat .../berth-unprotected: directory not empty

When berthd goes away mid-run, the berth run listener writes a record to berth-unprotected/ and waits to re-attach. If the engine exits during that wait, Run closes done and returns right away. The listener removes the record a moment later, on its own goroutine. In the test, the daemon stops before the engine is killed, so RemoveAll sometimes ran inside that window.

Run now hangs up its first connection when the engine exits, as it already does for a re-attached connection. It then waits for the listener goroutine to return before it returns itself. The listener can block only on calls that end when the engine exits or that time out (lendCallTimeout), so the wait cannot hang.

TestRunReturnsWithItsLostRecordGone stops the daemon, waits for the record, kills the engine, and checks that berth-unprotected/ is empty once Run returns. Before the fix, it failed 12 of 20 runs with records left after Run returned: [<pid>.json]. After the fix, it and TestParkedEngineReattachesParked passed 20 of 20 runs each.

2. TestStrataRequestsReachTheLeaderboard: a fixture past the 24h window

The test pinned its requests to 2026-10-28 21:35 MDT. The engine watcher keeps 24 hours of requests (keepRequests), so from 2026-10-30 03:35 UTC it drops both rows. The test fails on main, on next, and on every open PR, #221 included. The fixture now sits an hour before the test runs, with the same MDT zone and microseconds. It passes with TZ set to UTC, America/Denver and Asia/Kolkata.

Proof

go build, gofmt, go vet, the Windows build and vet, golangci-lint v2.14.0 (0 issues) and go test -count=1 ./... all pass locally. The -count=1 matters here. A cached run reported the Strata test as passing after it had started to fail.

next needs the same two changes. I'll merge main into next after this lands.