Add teach-impeccable and review commands, dynamic placeholders

New commands:
- /teach-impeccable: One-time setup that gathers UX-focused design
  context (explores codebase first, then asks targeted questions)
- /review: UX design review evaluating hierarchy, clarity, emotional
  resonance (complements technical /audit)

Build system improvements:
- Dynamic {{model}}, {{ask_instruction}}, {{config_file}} placeholders
  per provider (Claude/Gemini/GPT/the model)
- context: fork support for Claude Code sub-agents (audit, extract)
- Skill reference auto-added to design commands

Skill refinements:
- Merged Design Thinking and Context Awareness sections
- Removed redundant patterns and technical questions
- More direct feedback guidance (radical candor)

Website updates:
- 17 commands (was 16)
- Review demo showing UX issues (HIERARCHY, NO PRIMARY, DEAD END)
- teach-impeccable in System group of periodic table

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

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

source/commands/simplify.md

@@ -7,6 +7,8 @@ args:
     required: false
 ---
 
+→ *Apply the frontend-design skill for design principles, if not already in context.*
+
 Remove unnecessary complexity from designs, revealing the essential elements and creating clarity through ruthless simplification.
 
 ## Assess Current State