v1.0.1: Fix hook path resolution

Fixed

• Flatten plugin structure: moved .claude-plugin/, hooks/, and skills/ from plugins/claude-git-native-issue/ to the repo root. Claude Code resolves hook paths relative to the repo root, so the nested structure prevented the UserPromptSubmit hook from firing silently.

This is a critical fix — the ambient task tracking behavior (auto-create/update/close issues, replacing internal TaskCreate/TaskUpdate/TaskList) was not activating because the hook path didn't resolve.