fix: Remove dependency on .auto-build/scripts - auto-create directories

- Commands now use ${CLAUDE_PLUGIN_ROOT}/scripts/ for worktree scripts
- Directory .auto-build-data/ is created automatically when needed
- No manual setup required - plugin is self-contained
- Updated help.md, status.md, worktree.md, spec.md, build.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugin/commands/help.md

@@ -63,13 +63,11 @@ Display comprehensive help for the Auto-Build system.
 - **Memory**: `.auto-build-data/memory/`
 - **Worktrees**: `../ab-worktrees/{project}-{feature}/`
 
-## Setup
+## First Time Setup
 
-If not already set up:
-```bash
-bash .auto-build/scripts/setup.sh
-```
+The plugin automatically creates `.auto-build-data/` when you run your first command.
+No manual setup required!
 
 ## More Information
 
-See `.auto-build/README.md` for complete documentation.
+Run `/ab:status` to see current build progress.