Pr Formatter

@coopeverything/togetheros-pr-formatter

**AUTO-TRIGGER when user says:** "create PR", "format PR", "prepare PR body", "what category for this PR", "generate PR keywords" Formats TogetherOS pull requests with proper category (Cooperation Path), keywords, progress markers, and validation. Auto-selects category from module, generates relevant keywords, ensures correct structure for automation. Use proactively without asking permission when task matches skill purpose.