Add PitchDocs to Documentation & Security section

[nathanschram]

Adds PitchDocs to the Documentation & Security section.

PitchDocs is a documentation plugin with 14 skills and 12 commands that scans codebases, extracts features with file-level evidence, and generates marketing-ready docs. It differs from the existing documentation-generator entry by offering:

• 14 specialised skills covering README, CHANGELOG, ROADMAP, user guides, AI context files, llms.txt, launch artifacts, and more
• Evidence-based feature extraction across 10 signal categories
• AI context file generation — AGENTS.md, CLAUDE.md, .cursorrules, copilot-instructions.md, .windsurfrules, .clinerules, GEMINI.md
• GEO optimisation for AI citation
• Quality scoring (0–100) with CI-friendly output
• Context Guard hooks for drift detection

Pure Markdown, zero runtime dependencies, MIT licensed. Works with 9 AI coding tools.

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