The ReadyCh consumer goroutine could block indefinitely during shutdown
because it only checked for channel closure but not context cancellation.
Changes:
- Add select statement to check both ctx.Done() and ReadyCh closure
- Add shutdown logging for better debugging
- Add 100ms grace period for goroutines to exit
Fixes potential hangs when receiving SIGTERM/SIGINT.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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