[docs] fix: describe eco-safe overview backoff

[Wangmerlyn]

Summary

• replace unconditional overview wording with the eco-safe backoff contract
• add a doc guard against continuously allocates / always looks regressions
• update AGENTS.md and add a focused plan doc

Verification

• PYTHONPATH=src pytest tests/test_package_metadata.py -q
• PYTHONPATH=src pytest tests -q
• mkdocs build --strict
• pre-commit run --all-files --show-diff-on-failure
• git diff --check

Notes

• README is untouched and keeps the Zenodo DOI badge.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ed70d334-d399-43ee-b90f-0dc0b11ee11b

📥 Commits

Reviewing files that changed from the base of the PR and between 8d24a72 and e2f58c6.

📒 Files selected for processing (4)

• AGENTS.md
• docs/index.md
• docs/plans/docs-eco-safe-overview.md
• tests/test_package_metadata.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/docs-eco-safe-overview

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[gemini-code-assist]

Code Review

This pull request updates the KeepGPU documentation and agent guidelines to clarify that the default loop backs off when utilization telemetry is unavailable, reserving unconditional keepalive work for explicit configuration via --busy-threshold -1. It also adds a corresponding test to enforce these documentation requirements. The reviewer suggested making the test's regular expression more robust to handle variations of the term 'back off' (such as 'backing off' or 'back-off').

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