release: v0.2.0

[TheTrueSCU]

This PR prepares the repository for the v0.2.0 release.

Key highlights of this release:

1. GitHub PR Integration: Full support for highlighting pull request status and state.
2. Hygiene Scoring: Quantitative repository health scoring with weighted deductions.
3. Advanced Detection: Added WIP commits, direct pushes, contributor silos, and back-merge detection.
4. Squash-and-Merge Recovery: Logical reconstruction of squashed branches via GitHub metadata.
5. CI Mode: Standardized CLI support for quality gating in CI pipelines.
6. Improved UX: Automated text contrast (luminance-based) and robust Mermaid rendering.
7. Refactored Architecture: Centralized command logic for consistent cross-CLI behavior.