Split ReportState into a public method that skips when closed (used by
RunDaemon) and a private reportState that always sends (used by Close).
This prevents the server from deleting ephemeral runners before final
logs are uploaded. Add test reproducing the exact interleaving from #793.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The initial `if r.closed` guard in RunDaemon() was still reading
r.closed without holding closedM, causing a data race with Close().
Wrap it with closedM to match the other access sites.
Add TestReporter_RunDaemonClose_Race which exercises RunDaemon() and
Close() concurrently — the exact scenario from #793. Without the fix,
`go test -race` reliably detects the data race.
Enable the -race flag in `make test` so CI catches data races.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
