Ignore tmp/ media export directory to prevent accidental binary commits

[Copilot]

The review feedback flagged that query.py media now defaults to a relative tmp/ output directory, but the repo was not ignoring that path. This creates commit risk for exported media artifacts.

• What changed

  • Added tmp/ to .gitignore under generated/local-only outputs.

• Why this addresses the review comment

  • Keeps query.py media default behavior intact while ensuring exported binaries in tmp/ are excluded from version control.

# Generated / local-only
chat-*.txt
chat_timeline.html
tmp/

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