Add Finnish AI text humanizer skill

[Hakku]

Summary

Adds a prompt that detects and removes 26 AI-generated markers from Finnish text, making it sound like a native Finnish speaker wrote it.

Finnish has unique linguistic characteristics (agglutination, particles, consonant gradation) that generic humanizers miss. This prompt covers:

• 12 Finnish-specific patterns: passive overuse, missing particles, translation structures, genitive chains, etc.
• 14 universal patterns adapted for Finnish: significance inflation, flattering tone, filler phrases, etc.
• Adaptive workflow: short text processed directly, long text analyzed first with user confirmation

How to validate

1. Ask any LLM to generate a 100-word Finnish paragraph about remote work
2. Use this prompt on the generated text
3. Compare before/after — the humanized version should have shorter sentences, particles (-han, -pa, kyllä), and no filler phrases

Details

• Source repo: Hakku/finnish-humanizer (MIT)
• Full pattern reference: patterns.md
• npm start and fix-line-endings.sh have been run

[aaronpowell]

I think this would be better defined as a skill rather than a prompt file.

Prompts need to be manually invoked by the user, whereas using a skill, the agent can leverage them in the same was a custom instruction could be leveraged, but it can also be invoked by a slash command if you want to specifically execute it.

[Hakku]

Converted from prompt to skill format as requested:

• Moved prompts/humanize-finnish-ai-text.prompt.md → skills/finnish-humanizer/SKILL.md
• Added proper skill frontmatter (name, description)
• Bundled references/patterns.md with the full 26-pattern list
• Regenerated README tables via npm start
• Validation passes: npm run skill:validate → 44/44 valid

The description follows the WHAT + WHEN + keywords pattern from the contributing guide.