Introduce `/project-wiki` bundled skill that orchestrates a multi-stage pipeline to
analyze a codebase and generate a complete technical documentation wiki. Adds four
specialized sub-agents:
- WikiProjectAnalyze: deep repository analysis and classification
- WikiCatalogueDesign: dynamic document structure design based on project traits
- WikiDocumentGenerate: code-driven technical document authoring
- WikiIndexGeneration: structured index and navigation creation
Also updates .gitignore to exclude `.costrict`, `.claude`, and `/costrict` directories.
