Support transcription for single agent live scenario

[jinnigu]

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Description

• Closes: Add transcription support for single agent live scenario for Python ADK #3128

Problem:
No transcription support for single agent live scenario in Python ADK.

Solution:
Add transcription support for single agent live scenario for Python ADK.

Testing Plan

Unit Tests:

• I have added or updated unit tests for my change.
• All unit tests pass locally.

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

[gemini-code-assist]

Summary of Changes

Hello @jinnigu, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a missing feature in the Python ADK by introducing comprehensive support for audio transcription in single-agent live streaming scenarios. Previously, transcription capabilities were primarily configured for multi-agent setups. The changes ensure that single-agent live interactions can now fully leverage transcription, enhancing the functionality and consistency of the ADK's live streaming features across different agent configurations.

Highlights

• Enable Transcription for Single-Agent Live Scenarios: The core logic for creating invocation contexts in live streaming has been updated to automatically enable audio transcription for single-agent scenarios, aligning with existing multi-agent behavior.
• Refined Transcription Logic: The condition for applying transcription configurations has been broadened from requiring sub-agents to simply checking for the presence of a live request queue, ensuring transcription is enabled whenever a live request queue is present, regardless of the number of agents.
• Comprehensive Unit Tests: New unit tests have been introduced to cover single-agent live streaming with transcription, including cases where transcription is implicitly enabled, explicitly configured, and when text modality is requested, ensuring robust functionality.

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[gemini-code-assist]

Code Review

This pull request adds transcription support for single-agent live scenarios, which was previously only available for multi-agent setups. The core change involves modifying the condition for enabling transcription configs to apply to any live scenario. New unit tests have been added to verify this new functionality. My review has identified a significant issue where the implementation logic to enable default transcription is not being executed due to how RunConfig is defined, and the tests are passing for the wrong reasons, giving a false sense of correctness. I've provided detailed comments and suggestions to address this in both the implementation and the tests.

[ryanaiagent]

Hi @jinnigu, Thank you for your contribution!
We appreciate you taking the time to submit this pull request. Your PR has been received by the team and is currently under review. We will provide feedback as soon as we have an update to share.