fix(agents-realtime): preserve GA audio formats when top-level voice is present

[cnaples79]

Summary

When a session config includes top-level , the converter treated the config as legacy and discarded GA audio formats. This change refines legacy detection and lifts top-level into in the GA path, preserving GA formats.

Rationale

Issue #495 reports that adding causes fallback to legacy, resetting telephony formats like . GA-shaped configs should remain GA even when is provided.

Changes

• Remove top-level from the legacy detection heuristic.
• In GA conversion, set from top-level if GA audio config is present, or construct a minimal GA audio block if not.
• Add regression test to ensure GA formats persist when is present.

Tests

• New test validates preserves and lifts .

Fixes #495

[changeset-bot]

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Latest commit: 937b48e

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[seratch]

Thanks for sending this but the issue was resolved by #497