justsisyphus 207a39b17a fix(skill): unify skill resolution to support user custom skills
sisyphus_task was only loading builtin skills via resolveMultipleSkills().
Now uses resolveMultipleSkillsAsync() which merges discoverSkills() + builtin skills.

- Add getAllSkills(), extractSkillTemplate(), resolveMultipleSkillsAsync()
- Update sisyphus_task to use async skill resolution
- Refactor skill tool to reuse unified getAllSkills()
- Add async skill resolution tests
2026-01-16 01:57:57 +09:00
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