chore: untrack LOOP.md and add to .gitignore

[zackees]

Summary

• Removes LOOP.md from the tracked tree and adds /LOOP.md + tasks/loop-runs/ to .gitignore.
• LOOP.md is a per-session operator benchmark spec, not a stable doc; committing it in docs(perf): LOOP.md — warm-deploy agent loop spec #113 was a mistake.
• Reverts the file addition from cacba6f without reverting the .gitignore change that keeps it ignored going forward.

Test plan

• git status clean after merge
• /LOOP.md still writable locally without showing in git status

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 144132a9-3b17-482b-b88b-c979b8134f4f

📥 Commits

Reviewing files that changed from the base of the PR and between cacba6f and 5a15203.

📒 Files selected for processing (2)

• .gitignore
• LOOP.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/gitignore-loop-md

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