feat: add withRetry utility and wrap all transcription services #981
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This PR introduces a reusable withRetry utility for retrying async operations with delay and timeout. It wraps all transcription services (openai.ts, groq.ts, deepgram.ts, elevenlabs.ts, mistral.ts) with contributor-safe retry logic.
Retries: 2
Delay: 1000ms
Timeout: 8000ms
Also added documentation to services/README.md. No tests added yet — happy to follow up if needed.