[docs] docs: pin getting-started sanity check gpu

[Wangmerlyn]

Summary

• Pin the Getting Started sanity-check command to visible GPU 0 with --gpu-ids 0.
• Clarify that omitting --gpu-ids intentionally targets all visible GPUs.
• Add an AGENTS.md guard so first-run CLI examples stay explicit unless demonstrating all-visible behavior.

Verification

• rg -n "keep-gpu --interval 30 --vram 512MB|keep-gpu --gpu-ids 0 --interval 30 --vram 512MB|First-run CLI" AGENTS.md docs/getting-started.md README.md -S -> old command absent; new command and AGENTS guard present
• mkdocs build --strict -> passed, existing Material warning only
• git diff --check -> passed
• pre-commit run --all-files --show-diff-on-failure -> passed
• Local subagent code review (Pascal the 4th) -> no Critical, Important, or Minor issues

Notes

• README was not modified; the Zenodo DOI badge remains present.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 996329db-cf8e-4ea2-9a15-c856c36b8e9b

📥 Commits

Reviewing files that changed from the base of the PR and between 13780ef and 0f7a011.

📒 Files selected for processing (2)

• AGENTS.md
• docs/getting-started.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/getting-started-gpu-id

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