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>
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