v11.8.2 - Worktree creation in /feature command

✨ Added

Worktree Creation in /feature Command

The /feature command now creates isolated git worktrees by default:

• Automatic worktree creation: Running /feature "description" creates worktrees/feature/XXX-slug/ instead of just a branch
• State tracking: Stores git.worktree_enabled and git.worktree_path in state.yaml
• Clear output: Shows worktree path and cd command for easy navigation
• Graceful fallback: Falls back to regular branch if worktree creation fails
• Configurable: Set worktrees.auto_create: false in preferences to disable

This completes the v11.8.0 worktree-first safety model - now features actually create worktrees.

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Full Changelog: v11.8.1...v11.8.2