⚡ Bolt: Optimize Participant Removal Latency

[Adityasingh-8858]

💡 What:
Updated remove_participant_from_room in backend/main.py to remove a participant directly using their identity, rather than first fetching the entire participant list. Handled missing participants using standard exception catching.

🎯 Why:
The previous implementation performed an expensive and unnecessary list_participants network request just to verify the participant existed before attempting removal. By using an "Easier to Ask for Forgiveness than Permission" (EAFP) approach, we cut the number of required external API calls in half.

📊 Impact:
Reduces the LiveKit API network latency of the /complete-transfer endpoint by approximately 50%, providing a snappier handoff experience. Removes an O(N) array scan.

🔬 Measurement:
Verified the API behavior locally via tests. Run pytest -v -p anyio -p asyncio -o asyncio_mode=auto in the backend/ directory to confirm test_complete_integration passes.

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PR created automatically by Jules for task 1174786776530338233 started by @Deepaksingh7238

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[Copilot]

Pull request overview

This PR optimizes LiveKit participant removal during transfer completion by removing a participant directly by identity (EAFP), avoiding an extra list_participants call to reduce latency in the /complete-transfer flow.

Changes:

• Updated remove_participant_from_room to call remove_participant directly without prefetching participants.
• Added a Jules “bolt” note documenting the optimization rationale and suggested approach for future changes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
backend/main.py	Removes the list_participants pre-check and performs direct participant removal with exception handling.
.jules/bolt.md	Documents the optimization learning/action for future reference.

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