feat(version-scanner): refine python version checks and document boundary logic

[chalmerlowe]

This pull request refines the regex rules configuration used by the dependency version scanner. It improves Python runtime version boundary checking and documents the intent behind boundary offsets.

Key changes:

• Refines python_requires checks to support optional patch versions (e.g., matching >=3.7.0).
• Adds subscript-based minor version checks (e.g., sys.version_info[1] >= 7).
• Adds inline YAML comments to document the +1 and -1 offset logic for external reviewers and auditors.

[gemini-code-assist]

Code Review

This pull request updates the version scanner regex configurations to support optional patch versions in python_requires, adds rules for matching sys.version_info[1], and introduces a new dependency_requirement rule group. It also cleans up unused imports in tests and updates test validation to dynamically resolve dependency names. The review feedback highlights several opportunities to make the regex patterns more robust: restricting optional patch versions on boundary rules to (?:\.0)? to avoid false positives, adding a negative lookahead (?!\d) to the dependency requirement pattern to prevent partial version matches, and allowing optional whitespace inside the brackets for sys.version_info[1].