fix(agents): bypass AudioResampler when input and output sample rates…

[KrishnaShuk]

Description

Fixes #1431

Short-circuits the AudioResampler logic natively in utils.ts when the incoming chunk sampleRate perfectly matches the requested outputRate.

This efficiently prevents exhaustive runtime FFI overhead instantiations and stops the runaway RSS memory padding up to several gigabytes over long streaming sessions.

Pre-Review Checklist

• Build passes: All builds (lint, typecheck, tests) pass locally
• AI-generated code reviewed: Removed unnecessary comments and ensured code quality
• Changes explained: All changes are properly documented and justified above
• Scope appropriate: All changes relate to the PR title, or explanations provided for why they're included
• Video demo: A small video demo showing changes works as expected and did not break any existing functionality using Agent Playground (if applicable)

Testing

• Automated tests added/updated (if applicable)
• All tests pass
• Make sure both restaurant_agent.ts and realtime_agent.ts work properly (for major changes)

Additional Notes

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Note to reviewers: Please ensure the pre-review checklist is completed before starting your review.

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Latest commit: c50570e

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[toubatbrian]

@KrishnaShuk Can you confirm if it's working in a real agent session?