feat(packs): Add kai-prompting-skill v1.0.0

Meta-prompting system for dynamic prompt generation:
- Claude 4.x Best Practices and Ultimate Prompt Template
- Five Handlebars primitives (Roster, Voice, Structure, Briefing, Gate)
- RenderTemplate.ts and ValidateTemplate.ts CLI tools
- ~65% token savings through templated approach

Credits IndyDevDan for meta-prompting inspiration.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: danielmiessler