feat: add multi-agent parallel development system

.agents/README.md

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+# Multi-Agent Parallel Development System
+
+## Overview
+
+This directory contains a **revolutionary parallel development system** that enables **4x faster bug fixing** by running multiple Claude Code sessions simultaneously using git worktrees. Instead of fixing bugs sequentially, you can now tackle **20 critical vulnerabilities** in parallel.
+
+## Key Benefits
+
+- **🚀 4x Speed Improvement** - Fix 4 critical bugs simultaneously instead of one at a time
+- **🔒 Perfect Isolation** - Each Claude session works in independent file state via git worktrees
+- **🎯 Specialized Context** - Each agent becomes expert in specific vulnerability types
+- **⚡ True Parallelization** - Leverage multiple CPU cores and Claude sessions concurrently
+
+## Quick Start
+
+### 1. Setup (One-time)
+```bash
+# Create all worktrees for parallel development
+./setup-worktrees.sh
+```
+
+### 2. Launch Critical Fixes (Recommended First Step)
+```bash
+# Start 4 parallel Claude sessions for critical NPE vulnerabilities
+./run-parallel-claude.sh critical
+```
+
+### 3. Connect to Claude Sessions
+```bash
+# Attach to specific sessions via tmux
+tmux attach -t rules-antlr-npe-env      # TODO-001: Environment Variable NPE Fixes
+tmux attach -t rules-antlr-npe-builder  # TODO-002: Builder Method Parameter NPE Fixes
+tmux attach -t rules-antlr-npe-language # TODO-003: Language Path Conversion NPE Fixes
+tmux attach -t rules-antlr-npe-utility  # TODO-004: Utility Method NPE Fixes
+```
+
+### 4. Create Pull Requests
+```bash
+# Create PRs for completed fixes
+./merge-workflow.sh critical
+
+# Check status of all worktrees
+./merge-workflow.sh status
+```
+
+### 5. Cleanup
+```bash
+# Remove all worktrees and cleanup environment
+./cleanup-worktrees.sh all
+```
+
+## System Components
+
+| File | Purpose |
+|------|---------|
+| **`README.md`** | This overview and quick start guide |
+| **`TODO.md`** | Detailed specifications for all 20 critical bug fixes with agent prompts |
+| **`WORKFLOW.md`** | Comprehensive workflow documentation with examples and troubleshooting |
+| **`setup-worktrees.sh`** | Creates git worktrees for parallel development |
+| **`run-parallel-claude.sh`** | Launches multiple Claude sessions in tmux |
+| **`merge-workflow.sh`** | Coordinates PR creation and merge workflow |
+| **`cleanup-worktrees.sh`** | Removes worktrees and cleans up environment |
+| **`test-workflow.sh`** | Tests the entire workflow system |
+
+## Critical Bugs Being Fixed
+
+### 🔴 Phase 1: Critical NPE Vulnerabilities (Parallel Execution)
+- **TODO-001**: Environment Variable NPE Fixes (AntlrRules.java main method)
+- **TODO-002**: Builder Method Parameter NPE Fixes  
+- **TODO-003**: Language Path Conversion NPE Fixes
+- **TODO-004**: Utility Method NPE Fixes
+
+### 🟠 Phase 2: High Priority Bazel Fixes (Parallel Execution)
+- **TODO-005**: Bazel Starlark Dictionary Access Fix (Bazel 6.0+ compatibility)
+- **TODO-006**: Bazel String Method Fix (Non-existent .elems() calls)
+
+### 🟡 Phase 3: Resource Management (Parallel Execution)
+- **TODO-007**: Process Stream Resource Leak Fixes
+- **TODO-008**: File Stream Resource Leak Fixes
+
+### 🟢 Phase 4: Quality Improvements
+- **TODO-009**: Array Bounds Safety Improvements
+- **TODO-010**: Error Message Quality Improvements
+
+## System Requirements
+
+### Required
+- **Git** - For worktree management
+- **Bash 4+** - For script functionality  
+- **Claude Code CLI** - For parallel development
+
+### Optional (Recommended)
+- **tmux** - For parallel session management (enables true parallel workflow)
+- **GitHub CLI** - For automated PR creation
+
+## Usage Examples
+
+### Start All Critical Fixes at Once
+```bash
+./setup-worktrees.sh                    # Create development environment
+./run-parallel-claude.sh critical       # Start 4 parallel sessions
+```
+
+### Work on Specific Priority Levels
+```bash
+./run-parallel-claude.sh bazel          # Bazel compatibility fixes
+./run-parallel-claude.sh resource       # Resource management fixes
+./run-parallel-claude.sh quality        # Quality improvements
+```
+
+### Manage Sessions
+```bash
+./run-parallel-claude.sh status         # Check active sessions
+./run-parallel-claude.sh kill           # Kill all sessions
+tmux list-sessions                       # List all tmux sessions
+```
+
+### Create Pull Requests
+```bash
+./merge-workflow.sh status              # Check what's ready for PR
+./merge-workflow.sh critical            # Create PRs for critical fixes
+./merge-workflow.sh all                 # Create PRs for all completed fixes
+```
+
+## Detailed Documentation
+
+- **`./TODO.md`** - Complete specifications for all 20 bug fixes with detailed agent prompts
+- **`./WORKFLOW.md`** - Comprehensive usage guide with troubleshooting and best practices
+
+## Testing the System
+
+```bash
+# Test entire workflow
+./test-workflow.sh
+
+# Test specific components
+./test-workflow.sh scripts              # Test script functionality
+./test-workflow.sh e2e                  # End-to-end workflow test
+```
+
+## How It Works
+
+1. **Git Worktrees** create isolated copies of the repository for each bug fix
+2. **Claude Code sessions** run in parallel via tmux, each in its own worktree
+3. **Specialized prompts** from TODO.md give each Claude specific context
+4. **Independent development** prevents conflicts between parallel fixes
+5. **Coordinated merging** ensures proper integration order
+
+## Integration with rules_antlr
+
+This multi-agent system is designed specifically for the **rules_antlr** project to address:
+- **15 Critical NPE vulnerabilities** that could cause JVM crashes
+- **3 High-priority Bazel logic errors** breaking compatibility with newer versions
+- **2 Resource management issues** causing gradual system degradation
+
+The system maintains full compatibility with existing rules_antlr development workflows while providing a **parallel alternative** for large-scale bug remediation.
+
+---
+
+**Ready to start? Run `./setup-worktrees.sh` and begin parallel development! 🚀**