Fix Haskell project setup and implement Mermaid processing
- Update docster.cabal to modern format with GHC 9.12.2 compatibility - Fix Mermaid code block detection using getDefaultExtensions - Switch from SVG to PNG output for PDF compatibility - Add CLAUDE.md with development instructions - Update tooling from mise to ghcup for Haskell management Known issues: - Generated diagram files are created in root directory instead of alongside source files - PDF generation fails with LaTeX errors for complex documents (missing \tightlist support) - HTML output lacks proper DOCTYPE (quirks mode) - Debug output still present in code 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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