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/tasks/create-doc.md

@@ -0,0 +1,74 @@
+# Create Document from Template Task
+
+## Purpose
+
+- Generate documents from any specified template following embedded instructions from the perspective of the selected agent persona
+
+## Instructions
+
+### 1. Identify Template and Context
+
+- Determine which template to use (user-provided or list available for selection to user)
+
+  - Agent-specific templates are listed in the agent's dependencies under `templates`. For each template listed, consider it a document the agent can create. So if an agent has:
+
+    @{example}
+    dependencies:
+    templates: - prd-tmpl - architecture-tmpl
+    @{/example}
+
+    You would offer to create "PRD" and "Architecture" documents when the user asks what you can help with.
+
+- Gather all relevant inputs, or ask for them, or else rely on user providing necessary details to complete the document
+- Understand the document purpose and target audience
+
+### 2. Determine Interaction Mode
+
+Confirm with the user their preferred interaction style:
+
+- **Incremental:** Work through chunks of the document.
+- **YOLO Mode:** Draft complete document making reasonable assumptions in one shot. (Can be entered also after starting incremental by just typing /yolo)
+
+### 3. Execute Template
+
+- Load specified template from `templates#*` or the /templates directory
+- Follow ALL embedded LLM instructions within the template
+- Process template markup according to `utils#template-format` conventions
+
+### 4. Template Processing Rules
+
+#### CRITICAL: Never display template markup, LLM instructions, or examples to users
+
+- Replace all {{placeholders}} with actual content
+- Execute all [[LLM: instructions]] internally
+- Process `<<REPEAT>>` sections as needed
+- Evaluate ^^CONDITION^^ blocks and include only if applicable
+- Use @{examples} for guidance but never output them
+
+### 5. Content Generation
+
+- **Incremental Mode**: Present each major section for review before proceeding
+- **YOLO Mode**: Generate all sections, then review complete document with user
+- Apply any elicitation protocols specified in template
+- Incorporate user feedback and iterate as needed
+
+### 6. Validation
+
+If template specifies a checklist:
+
+- Run the appropriate checklist against completed document
+- Document completion status for each item
+- Address any deficiencies found
+- Present validation summary to user
+
+### 7. Final Presentation
+
+- Present clean, formatted content only
+- Ensure all sections are complete
+- DO NOT truncate or summarize content
+- Begin directly with document content (no preamble)
+- Include any handoff prompts specified in template
+
+## Important Notes
+
+- Template markup is for AI processing only - never expose to users