docs: update CCW Commands & Skills reference with 8-field format

- Add CCW-COMMANDS-SKILLS-REFERENCE.md with comprehensive documentation
- Update docs/reference/commands-skills.md (English)
- Update docs/zh/reference/commands-skills.md (Chinese)
- Include 55 Slash Commands and 41 Skills
- Each entry follows 8-field format: Who, When, What, How, Output, Done, Failure & Recovery, Impact & Boundary
- Exclude academic skills (scholar-*, journal-paper-writing, software-manual)

Author: catlog22