ci: watch lint and test configuration

[nightcityblade]

Description

Closes #164.

Adds ruff.toml and pytest.ini to both the push and pull-request path filters for the lint workflow. This ensures configuration-only changes run the checks they control. docs-cli-check.yml is intentionally unchanged because neither file configures documentation checks.

Verification:

• pytest tests/ -q — 50 passed
• uvx ruff==0.16.1 check . — passed
• Parsed .github/workflows/lint.yml with PyYAML — valid
• CI trigger proof: run 31559809262, fired for the initial commit's temporary comment-only ruff.toml change

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would change existing behavior)
• Documentation update
• Refactor / code cleanup
• Other:

Checklist

• I have tested my changes locally
• If this affects shared logic (extraction, download engine), I also
  applied the equivalent change to moon_cli.py (N/A; CI-only change)
• I have kept the single-file architecture (no package split)
• I have not added new dependencies without justification in the PR
  description

Screenshots / logs (if applicable)

N/A — CI-only change.