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/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "ab",
   "description": "Auto-Build: Spec-driven build orchestration with worktree isolation and session memory",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "author": {
     "name": "ROA2WEB Team"
   }