[cli] fix: reject mismatched start job ids

[Wangmerlyn]

Summary

• validate successful start_keep payloads before rendering CLI success output
• reject keep-gpu start --job-id X responses that return a different job_id
• document the start response echo contract and update AGENTS.md result-validation guidance

Verification

• PYTHONPATH=src pytest tests/test_cli_service_commands.py -k "start_command_rejects_mismatched_job_id_result or start_command_rejects_malformed_job_id_result" -q
• PYTHONPATH=src pytest tests/test_cli_service_commands.py -q
• mkdocs build --strict
• pre-commit run --all-files --show-diff-on-failure
• PYTHONPATH=src pytest tests -q

Local subagent review: no must-fix issues found.

README note: Zenodo DOI badge remains present at README.md:5.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d5d60289-0197-4994-afa4-ed79d2932189

📥 Commits

Reviewing files that changed from the base of the PR and between 85fbce5 and c634dbb.

📒 Files selected for processing (4)

• AGENTS.md
• docs/reference/cli.md
• src/keep_gpu/cli.py
• tests/test_cli_service_commands.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/cli-start-job-id-match

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