feat: add UserData generic to JobProcess

[u9g]

Allows users to define typed process-level userData instead of relying on unchecked index access and type assertions.

Description

Adds a UserData generic type parameter to JobProcess, JobContext, Agent, and defineAgent. Defaults to Record<string, unknown> so all existing code continues to work unchanged.

Changes Made

• JobProcess<UserData> — userData property is now typed as UserData instead of { [id: string]: unknown }
• JobContext<ProcUserData> — threads the generic through proc, participant entrypoints, etc.
• getJobContext<ProcUserData>() — accepts an optional generic to narrow the return type
• Agent<ProcUserData> and defineAgent<ProcUserData>() — generic flows through entry and prewarm callbacks

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

• All 628 existing tests pass
• Type tests in tool_context.type.test.ts pass
• pnpm build:agents succeeds (including tsc declaration emit)
• Make sure both restaurant_agent.ts and realtime_agent.ts work properly (for major changes)

Additional Notes

N/A

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

[CLAassistant]

All committers have signed the CLA.

[changeset-bot]

🦋 Changeset detected

Latest commit: dc56a3f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 24 packages

Name	Type
@livekit/agents	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-assemblyai	Patch
@livekit/agents-plugin-baseten	Patch
@livekit/agents-plugin-bey	Patch
@livekit/agents-plugin-cartesia	Patch
@livekit/agents-plugin-deepgram	Patch
@livekit/agents-plugin-elevenlabs	Patch
@livekit/agents-plugin-google	Patch
@livekit/agents-plugin-hedra	Patch
@livekit/agents-plugin-inworld	Patch
@livekit/agents-plugin-lemonslice	Patch
@livekit/agents-plugin-livekit	Patch
@livekit/agents-plugin-mistral	Patch
@livekit/agents-plugin-neuphonic	Patch
@livekit/agents-plugin-openai	Patch
@livekit/agents-plugin-phonic	Patch
@livekit/agents-plugin-resemble	Patch
@livekit/agents-plugin-rime	Patch
@livekit/agents-plugin-sarvam	Patch
@livekit/agents-plugin-silero	Patch
@livekit/agents-plugins-test	Patch
@livekit/agents-plugin-trugen	Patch
@livekit/agents-plugin-xai	Patch

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 3 additional findings.

[toubatbrian]

LG! Feel free to merge