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>

.bmad-core/agent-teams/team-all.yml

@@ -1,16 +0,0 @@
-bundle:
-  name: Team All
-  icon: 👥
-  description: This is a full organization of agents and includes every possible agent. This will produce the larges bundle but give the most options for discussion in a single session
-
-agents:
-  - bmad-orchestrator
-  - "*"
-
-workflows:
-  - brownfield-fullstack
-  - brownfield-service
-  - brownfield-ui
-  - greenfield-fullstack
-  - greenfield-service
-  - greenfield-ui