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/status.md

@@ -10,7 +10,7 @@ Display the current status of Auto-Build, including active specs and builds.
 
 1. **Check Data Directory**
    - Verify `.auto-build-data/` exists
-   - If not, inform user to run setup: `bash .auto-build/scripts/setup.sh`
+   - If not, create it: `mkdir -p .auto-build-data/specs .auto-build-data/memory`
 
 2. **List Active Specs**
    - Read all directories in `.auto-build-data/specs/`
@@ -74,4 +74,4 @@ Quick Actions:
 ## Edge Cases
 
 - If no specs exist: "No active builds. Start with /ab:spec <name>"
-- If data directory missing: "Run setup first: bash .auto-build/scripts/setup.sh"
+- If data directory missing: Create it automatically