[cli] fix: keep service JSON ANSI-free

[Wangmerlyn]

Summary

• route status/stop/list-gpus machine JSON through a plain stdlib JSON writer instead of Rich rendering
• add forced-color regression coverage for success and error JSON paths
• document that service JSON output is ANSI-free under pseudo-TTY/forced-color consoles

Verification

• RED: forced-color CLI JSON tests failed with ANSI escapes before the helper change
• PYTHONPATH=src pytest tests/test_cli_service_commands.py::test_service_json_commands_stay_plain_json_when_console_color_is_enabled tests/test_cli_service_commands.py::test_service_json_errors_stay_plain_json_when_console_color_is_enabled -q -> 4 passed
• PYTHONPATH=src pytest tests/test_cli_service_commands.py -q -> 230 passed
• PYTHONPATH=src pytest tests -q -> 936 passed, 11 skipped
• mkdocs build --strict -> passed with known Material warning
• pre-commit run --all-files --show-diff-on-failure -> passed
• local subagent code review -> clean, ready to PR

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1975fafb-0840-4c92-9022-b0d2472393a2

📥 Commits

Reviewing files that changed from the base of the PR and between 40952bf and 10880e2.

📒 Files selected for processing (6)

• AGENTS.md
• docs/guides/cli.md
• docs/plans/fix-cli-json-output.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-machine-json-plain-output

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[gemini-code-assist]

Code Review

This pull request ensures that CLI service commands (status, stop, and list-gpus) output plain, structured JSON without any Rich color or highlighting, even in pseudo-TTY or forced-color environments. This is achieved by introducing a _print_machine_json helper that uses the standard library's json.dumps to write directly to the console stream, bypassing Rich's rendering. Relevant documentation, plans, and tests have been updated to reflect and verify this change. There are no review comments to address, and I have no additional feedback to provide.

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