Add German language support with auto-detection

[pipamann]

Summary

This PR adds German language support to the humanizer skill, based on the German Wikipedia article Wikipedia:Anzeichen für KI-generierte Inhalte.

Key changes:

• New SKILL-DE.md with 24 German AI writing patterns
• New SKILL-EN.md for explicit English-only use
• Updated SKILL.md as universal wrapper with automatic language detection
• Updated documentation for multilingual support

Structure

humanizer/
├── SKILL.md      # Universal (auto-detects EN/DE)
├── SKILL-EN.md   # English-only patterns
├── SKILL-DE.md   # German-only patterns
├── README.md     # Updated with both languages
└── WARP.md       # Updated development guide

User Experience

• /humanizer → Auto-detects language, applies correct patterns (most common use)
• /humanizer-en → Explicit English-only
• /humanizer-de → Explicit German-only

German Patterns

24 patterns covering:

• Content patterns: Symbolism inflation, promotional language, superficial analyses, vague authorities, formulaic conclusions, editorial comments
• Language patterns: AI conjunctions, Fazit sections, negative parallelisms, trikolon, synonym cycling, false ranges
• Style patterns: Em dash overuse, boldface, inline headers, emojis
• Communication patterns: Chatbot artifacts, knowledge cutoffs, prompt rejection, sycophantic tone, abrupt cutoffs
• Filler/hedging: Filler phrases, excessive hedging, generic conclusions

Differences from English:

• ~70% overlap with translated patterns
• 3 NEW patterns not in English (prompt rejection, abrupt cutoffs, editorial comments)
• 3 EXCLUDED patterns that don't apply to German (copula avoidance, title case, curly quotes)

Backward Compatibility

Existing users of /humanizer will get the enhanced auto-detection behavior. The skill now supports both English and German text seamlessly.

References

• English source: Wikipedia:Signs of AI writing
• German source: Wikipedia:Anzeichen für KI-generierte Inhalte