refactor: remove dead suggestions module and deduplicate CLI helpers

[qkal]

Summary

Continues maintainability cleanup by removing dead Phase 1 code and deduplicating CLI adapter helpers.

Findings addressed

• suggestions.py and SuggestedAction were unused in production (Phase 2 uses NextAction in actions.py)
• _tool_unavailable was duplicated across uv.py, ruff.py, and pyright.py
• Safe path argument validation was duplicated between Ruff and Pyright adapters
• path_to_display() was unused

Changes

• Remove suggestions.py, SuggestedAction, and path_to_display()
• Add cli/errors.py with tool_unavailable_diagnostic
• Add cli/path_args.py with shared safe Python path argument helpers
• Update UV/Ruff/Pyright adapters to use shared modules
• Replace test_risk_suggestions.py with focused test_risk.py

Test plan

• uv run ruff check .
• uv run pyright --pythonpath .venv/bin/python
• uv run pytest -q (328 passed)

  

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 48b901f0-e3b4-4797-a6cb-4b645e8ec860

📥 Commits

Reviewing files that changed from the base of the PR and between 5b998f6 and 315081b.

📒 Files selected for processing (9)

• src/agent_quality_mcp/cli/errors.py
• src/agent_quality_mcp/cli/path_args.py
• src/agent_quality_mcp/cli/pyright.py
• src/agent_quality_mcp/cli/ruff.py
• src/agent_quality_mcp/cli/uv.py
• src/agent_quality_mcp/models.py
• src/agent_quality_mcp/suggestions.py
• tests/unit/test_risk.py
• tests/unit/test_risk_suggestions.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cursor/dead-code-cli-dedup-6196

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.