Add comprehensive Cursor rules file that extends base context with universal
constraints for creating developer-grade, reproducible technical guides.
Includes structured templates, validation checklists, and evidence-backed
documentation standards.
- Establishes 11 required sections for technical guides
- Enforces UTC timestamps and evidence requirements
- Provides Mermaid diagram requirements and API contract templates
- Includes competence and collaboration hooks per base context
- Sets coaching level to standard with 10-minute timeboxing