chore(ipc): increase memory warning threshold

[rosetta-livekit-bot]

Ports livekit/agents#6073 to agents-js.

• Increase the default job process memory warning threshold from 500 MB to 1000 MB.
• No tests added, matching the upstream change.

Verification:

• pnpm build:agents

[changeset-bot]

⚠️ No Changeset found

Latest commit: c1ff7d3

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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