Node 20, installer improvements, agent improvements and Expansion Pack for game dev (#232)

* feat: add expansion pack installation system with game dev and infrastructure expansion packs

- Added expansion pack discovery and installation to BMAD installer
- Supports interactive and CLI installation of expansion packs
- Expansion pack files install to destination root (.bmad-core)
- Added game development expansion pack (.bmad-2d-phaser-game-dev)
  - Game designer, developer, and scrum master agents
  - Game-specific templates, tasks, workflows, and guidelines
  - Specialized for Phaser 3 + TypeScript development
- Added infrastructure devops expansion pack (.bmad-infrastructure-devops)
  - Platform engineering agent and infrastructure templates
- Expansion pack agents automatically integrate with IDE rules
- Added list:expansions command and --expansion-packs CLI option

🤖 Generated with Claude Code

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

* alpha expansion packs and installer update to support installing expansion packs optionally

* node20

---------

Co-authored-by: Brian Madison <brianmadison@Brians-MacBook-Pro.local>
Co-authored-by: Claude <noreply@anthropic.com>

expansion-packs/bmad-infrastructure-devops/README.md

@@ -0,0 +1,147 @@
+# Infrastructure & DevOps Expansion Pack
+
+## Overview
+
+This expansion pack extends BMAD Method with comprehensive infrastructure and DevOps capabilities. It's designed for teams that need to define, implement, and manage cloud infrastructure alongside their application development.
+
+## Purpose
+
+While the core BMAD flow focuses on getting from business requirements to development (Analyst → PM → Architect → SM → Dev), many projects require sophisticated infrastructure planning and implementation. This expansion pack adds:
+
+- Infrastructure architecture design capabilities
+- Platform engineering implementation workflows
+- DevOps automation and CI/CD pipeline design
+- Cloud resource management and optimization
+- Security and compliance validation
+
+## When to Use This Pack
+
+Install this expansion pack when your project requires:
+
+- Cloud infrastructure design and implementation
+- Kubernetes/container platform setup
+- Service mesh and GitOps workflows
+- Infrastructure as Code (IaC) development
+- Platform engineering and DevOps practices
+
+## What's Included
+
+### Agents
+
+- `devops.yml` - DevOps and Platform Engineering agent configuration
+
+### Personas
+
+- `devops.md` - DevOps Engineer persona (Alex)
+
+### IDE Agents
+
+- `devops.ide.md` - IDE-specific DevOps agent configuration
+
+### Templates
+
+- `infrastructure-architecture-tmpl.md` - Infrastructure architecture design template
+- `infrastructure-platform-from-arch-tmpl.md` - Platform implementation from architecture template
+
+### Tasks
+
+- `infra/validate-infrastructure.md` - Infrastructure validation workflow
+- `infra/review-infrastructure.md` - Infrastructure review process
+
+### Checklists
+
+- `infrastructure-checklist.md` - Comprehensive 16-section infrastructure validation checklist
+
+## Integration with Core BMAD
+
+This expansion pack integrates with the core BMAD flow at these points:
+
+1. **After Architecture Phase**: The Architect can trigger infrastructure architecture design
+2. **Parallel to Development**: Infrastructure implementation can proceed alongside application development
+3. **Before Deployment**: Infrastructure must be validated before application deployment
+
+## Installation
+
+To install this expansion pack, run:
+
+```bash
+npm run install:expansion infrastructure
+```text
+
+Or manually:
+
+```bash
+node tools/install-expansion-pack.js infrastructure
+```text
+
+This will:
+
+1. Copy all files to their appropriate locations in `.bmad-core/`
+2. Update any necessary configurations
+3. Make the DevOps agent available in teams
+
+## Usage Examples
+
+### 1. Infrastructure Architecture Design
+
+After the main architecture is complete:
+
+```bash
+# Using the Architect agent
+*create-infrastructure
+
+# Or directly with DevOps agent
+npm run agent devops
+```text
+
+### 2. Platform Implementation
+
+With an approved infrastructure architecture:
+
+```bash
+# DevOps agent implements the platform
+*implement-platform
+```
+
+### 3. Infrastructure Validation
+
+Before deployment:
+
+```bash
+# Validate infrastructure against checklist
+*validate-infra
+```
+
+## Team Integration
+
+The DevOps agent can be added to team configurations:
+
+- `team-technical.yml` - For technical implementation teams
+- `team-full-org.yml` - For complete organizational teams
+
+## Dependencies
+
+This expansion pack works best when used with:
+
+- Core BMAD agents (especially Architect)
+- Technical preferences documentation
+- Approved PRD and system architecture
+
+## Customization
+
+You can customize this expansion pack by:
+
+1. Modifying the infrastructure templates for your cloud provider
+2. Adjusting the checklist items for your compliance needs
+3. Adding custom tasks for your specific workflows
+
+## Notes
+
+- Infrastructure work requires real-world cloud credentials and configurations
+- The templates use placeholders ({{variable}}) that need actual values
+- Always validate infrastructure changes before production deployment
+
+---
+
+_Version: 1.0_
+_Compatible with: BMAD Method v4_