New fix tts branch

[vm0809]

Description
This PR fixes the TTS SynthesizeStream to properly handle retryable APIError conditions. It ensures that errors are only emitted after all retry attempts are exhausted, and it makes the retry logic more robust for all relevant APIError types.

Changes Made
Delay error emission until all retry attempts are completed.
Use a dynamic recoverable flag for error types based on their properties.
Prevents ERR_UNHANDLED_ERROR crashes and premature session termination.
Cleans up and documents retry mechanism.
Pre-Review Checklist
Build passes: Lint, typecheck, and tests pass locally
AI-generated code reviewed: Ensured code quality and removed unnecessary comments
Changes explained: All changes are documented and justified above
Scope appropriate: Only TTS error-handling logic is changed; no unrelated changes
Testing
Automated and manual tests confirm retry and error-handling logic work as expected
Confirmed core TTS flows in restaurant_agent.ts and realtime_agent.ts function as intended

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Latest commit: 4f02a85

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