test(gemini): cover suggest_commands end-to-end and fallback retry

[nazarli-shabnam]

Summary

• suggest_commands() in gemini.py (the actual Gemini call + response parsing + fallback-chain retry logic) had no test coverage — only its small helper functions were tested.
• Added tests/test_gemini_suggest_commands.py with a lightweight fake genai.Client, covering: a successful parse, retry-on-429 falling through AI_MODEL_FALLBACKS (with fallback_notifier verified), a non-retryable error propagating without trying fallbacks, the generic-AI-message path falling back to the local heuristic message, missing-API-key, and empty-diff short-circuit.

Test plan

• pytest -q
• ruff check . / ruff format --check .

Closes #18

(Re-opened as a new PR: the original PR #26 was auto-closed by GitHub when main's history was rewritten to correct a contributor's commit attribution — this branch is unchanged.)

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e909f8e3-25d4-4fe6-903c-b935e0478be8

📥 Commits

Reviewing files that changed from the base of the PR and between 11a379a and 8568d18.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• pyproject.toml
• tests/test_gemini_suggest_commands.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/gemini-suggest-commands-coverage

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