🧹 Refactor fetch_skill into separate helper methods

[frostmute]

🎯 What: The code health issue addressed
Refactored the fetch_skill method in claw2manus/fetcher.py, which was long and complex, into three distinct helper methods based on the resolution strategies (GitHub URL, Author/Name, and Fallback).

💡 Why: How this improves maintainability
Extracting the logic into separate methods improves readability, testability, and reduces cognitive load when modifying any particular resolution strategy.

✅ Verification: How you confirmed the change is safe
Ran the existing test suite (pytest tests/test_fetcher.py) and static checks (ruff check, ruff format) to verify no behavior was changed and all fallback/resolution logic works identical to before.

✨ Result: The improvement achieved
A much cleaner fetch_skill method that acts simply as a router to the appropriately delegated helper methods, resulting in more maintainable code overall.

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PR created automatically by Jules for task 1564058515231903527 started by @frostmute

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