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/worktree.md

@@ -23,7 +23,7 @@ Create a new isolated worktree for a feature.
 
 **Command:**
 ```bash
-bash .auto-build/scripts/worktree-create.sh {feature-name}
+bash ${CLAUDE_PLUGIN_ROOT}/scripts/worktree-create.sh {feature-name}
 ```
 
 **Output:**
@@ -53,7 +53,7 @@ List all active worktrees.
 
 **Command:**
 ```bash
-bash .auto-build/scripts/worktree-list.sh
+bash ${CLAUDE_PLUGIN_ROOT}/scripts/worktree-list.sh
 ```
 
 ### switch <feature-name>
@@ -99,7 +99,7 @@ If no feature-name:
 
 **Command:**
 ```bash
-bash .auto-build/scripts/worktree-cleanup.sh [feature-name]
+bash ${CLAUDE_PLUGIN_ROOT}/scripts/worktree-cleanup.sh [feature-name]
 ```
 
 ## Registry Format
@@ -131,7 +131,6 @@ Structure:
 ```
 /projects/
 ├── my-project/              # Main project
-│   ├── .auto-build/
 │   └── .auto-build-data/
 └── ab-worktrees/            # Worktrees directory
     ├── my-project-user-dashboard/