* fix: daemon warns instead of crashing on missing OpenAI speech credentials
validateOpenAiCredentialRequirements was throwing an error when
OpenAI speech providers were configured without credentials,
causing the daemon to crash before it could start serving health
checks. Changed to log a warning instead — the daemon starts
successfully and reports speech services as unavailable.
Closes#1367
* chore: address Greptile review feedback
- Remove duplicate warning in initializeOpenAiSpeechServices when
all credentials are missing (already warned by validate)
- Strengthen test assertions: check getListenTarget() after start
- Wrap daemon start/stop in try/finally for proper cleanup on failure
