chore(trainer): add unit tests for lifecycle tools

[Solaris-star]

Summary

Part of #68 — lifecycle section.

Adds unit coverage for delete_training_job and update_training_job with mocked SDK / CustomObjects API:

• confirmed=False preview gate for delete
• confirmed=True success path
• MCP ownership checks for non-admin personas + platform-admin bypass
• invalid name / invalid action / namespace policy short-circuits
• not-found and generic SDK error wrapping
• suspend/resume patch body (spec.suspend)

Testing

uv run pytest -q tests/unit/trainer/test_lifecycle.py
# 19 passed

make test-python
# 229 passed

ruff check / ruff format --check clean on the new file.

[google-oss-prow]

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[github-actions]

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Pull request overview

Adds lifecycle unit coverage for Trainer job deletion, suspension, and resumption.

Changes:

• Tests preview, success, validation, ownership, and error paths.
• Verifies suspend/resume patch bodies.

[Solaris-star]

Thanks for flagging this. The shared scaffold in #6 is not on main yet, so this PR cannot import its fixtures without duplicating that open PR. I have kept this branch compatible with current main and tightened the ownership and full SDK call assertions in 23939aa. Once #6 lands, I can rebase and convert these tests to the shared fixtures.

[Solaris-star]

Updated in 23939aa. The non-admin delete and update paths now capture is_mcp_managed and assert the exact ("job-a", "default") arguments for allowed, denied, and API-error outcomes.

[Solaris-star]

Updated in 23939aa. Suspend, resume, and the managed non-admin path now use assert_called_once_with for the complete invocation, including group, version, namespace, plural, name, body, and request timeout.

[Solaris-star]

Thanks for the review. I agree this slice should use the shared Pattern C harness. That harness currently exists only in #6, which is still open and is not present on main. Copying its fixtures into this PR would duplicate the scaffold.

I will keep this branch based on main until #6 lands, then rebase and convert the confirmed paths to mock_trainer_client + verify_tool_*. At the same time I will tighten the ownership argument checks and assert the complete SDK calls. I will not request maintainer review before that update.