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Add discoverProjectAgentsSkills() for project-level .agents/skills/ and discoverGlobalAgentsSkills() for ~/.agents/skills/ — matching OpenCode's native skill discovery paths (https://opencode.ai/docs/skills/). Updated discoverAllSkills(), discoverSkills(), and createSkillContext() to include these new sources with correct priority ordering. Co-authored-by: dtateks <dtateks@users.noreply.github.com> Closes #1818