fix: standardize on file extension .yaml instead of a mix of yml and yaml

docs/agentic-tools/roo-code-guide.md

@@ -33,7 +33,7 @@ Select mode from the mode selector (usually in status bar):
 ### File Permission Summary
 
 - **Documentation agents** (analyst, pm, po, sm): `.md`, `.txt` only
-- **bmad-architect**: `.md`, `.txt`, `.yml`, `.yaml`, `.json`
+- **bmad-architect**: `.md`, `.txt`, `.yaml`, `.yaml`, `.json`
 - **bmad-qa**: Test files (`.test.*`, `.spec.*`) and `.md`
 - **bmad-ux-expert**: `.md`, `.css`, `.scss`, `.html`, `.jsx`, `.tsx`
 - **Full access**: `bmad-dev`, `bmad-bmad-master`, `bmad-orchestrator`

docs/core-architecture.md

@@ -75,12 +75,12 @@ The `.bmad-core` directory contains all the definitions and resources that give
 
 ### 3.2. Agent Teams (`.bmad-core/agent-teams/`)
 
-- **Purpose**: Team files (e.g., `team-all.yml`) define collections of agents and workflows that are bundled together for a specific purpose, like "full-stack development" or "backend-only". This creates a larger, pre-packaged context for web UI environments.
+- **Purpose**: Team files (e.g., `team-all.yaml`) define collections of agents and workflows that are bundled together for a specific purpose, like "full-stack development" or "backend-only". This creates a larger, pre-packaged context for web UI environments.
 - **Structure**: A team file lists the agents to include. It can use wildcards, such as `"*"` to include all agents. This allows for the creation of comprehensive bundles like `team-all`.
 
 ### 3.3. Workflows (`.bmad-core/workflows/`)
 
-- **Purpose**: Workflows are YAML files (e.g., `greenfield-fullstack.yml`) that define a prescribed sequence of steps and agent interactions for a specific project type. They act as a strategic guide for the user and the `bmad-orchestrator` agent.
+- **Purpose**: Workflows are YAML files (e.g., `greenfield-fullstack.yaml`) that define a prescribed sequence of steps and agent interactions for a specific project type. They act as a strategic guide for the user and the `bmad-orchestrator` agent.
 - **Structure**: A workflow defines sequences for both complex and simple projects, lists the agents involved at each step, the artifacts they create, and the conditions for moving from one step to the next. It often includes a Mermaid diagram for visualization.
 
 ### 3.4. Reusable Resources (`templates`, `tasks`, `checklists`, `data`)
@@ -239,10 +239,10 @@ bmad-method/
 │   │   ├── sm.md                 # Scrum master agent
 │   │   └── ux-expert.md          # UX designer agent
 │   ├── agent-teams/              # Pre-configured agent teams
-│   │   ├── team-all.yml          # All agents bundle
-│   │   ├── team-fullstack.yml    # Full-stack development team
-│   │   ├── team-ide-minimal.yml  # Minimal IDE-focused team
-│   │   └── team-no-ui.yml        # Backend-only team
+│   │   ├── team-all.yaml         # All agents bundle
+│   │   ├── team-fullstack.yaml   # Full-stack development team
+│   │   ├── team-ide-minimal.yaml # Minimal IDE-focused team
+│   │   └── team-no-ui.yaml       # Backend-only team
 │   ├── checklists/               # Quality assurance checklists
 │   │   ├── architect-checklist.md
 │   │   ├── po-master-checklist.md
@@ -268,11 +268,11 @@ bmad-method/
 │   │   ├── template-format.md    # Template markup spec
 │   │   └── workflow-management.md # Workflow helpers
 │   ├── workflows/                # Development workflows
-│   │   ├── brownfield-enhancement.yml
-│   │   ├── greenfield-fullstack.yml
-│   │   ├── greenfield-service.yml
-│   │   └── greenfield-simple.yml
-│   └── core-config.yml           # V4 configuration system
+│   │   ├── brownfield-enhancement.yaml
+│   │   ├── greenfield-fullstack.yaml
+│   │   ├── greenfield-service.yaml
+│   │   └── greenfield-simple.yaml
+│   └── core-config.yaml          # V4 configuration system
 │
 ├── dist/                         # Pre-built bundles (generated)
 │   ├── agents/                   # Individual agent bundles
@@ -378,7 +378,7 @@ bmad-method/
 
 ### Key Files
 
-- **core-config.yml**: V4's flexible configuration system
+- **core-config.yaml**: V4's flexible configuration system
 - **bmad-kb.md**: Central knowledge base loaded by most agents
 - **template-format.md**: Specification for BMAD's template markup
 - **dependency-resolver.js**: Manages agent resource loading

docs/user-guide.md

@@ -456,7 +456,7 @@ The SM agent serves as a critical bridge between high-level planning and technic
 
 When the SM agent executes the `create-next-story` task:
 
-1. **Loads Configuration**: Reads `core-config.yml` to understand project structure
+1. **Loads Configuration**: Reads `core-config.yaml` to understand project structure
 2. **Identifies Next Story**: Sequentially processes stories from epics (1.1, 1.2, 2.1, etc.)
 3. **Gathers Architecture Context**: Reads relevant sharded architecture documents based on story type:
 
@@ -1131,11 +1131,11 @@ This file allows you to define your preferred technologies, patterns, and standa
 
 When creating custom web bundles or uploading to AI platforms, include your `technical-preferences.md` content to ensure agents have your preferences from the start of any conversation.
 
-### Core Configuration (core-config.yml)
+### Core Configuration (core-config.yaml)
 
-The `bmad-core/core-config.yml` file is a critical V4 innovation that enables BMAD to work seamlessly with any project structure, providing maximum flexibility and backwards compatibility.
+The `bmad-core/core-config.yaml` file is a critical V4 innovation that enables BMAD to work seamlessly with any project structure, providing maximum flexibility and backwards compatibility.
 
-#### Understanding core-config.yml
+#### Understanding core-config.yaml
 
 This configuration file acts as a map for BMAD agents, telling them exactly where to find your project documents and how they're structured. It's what makes V4 agents intelligent enough to work with V3 projects, custom layouts, or any document organization you prefer.
 
@@ -1350,7 +1350,7 @@ customTechnicalDocuments:
 1. **Always Configure for Your Structure**: Don't force your project to match BMAD defaults
 2. **Keep devLoadAlwaysFiles Focused**: Only include files needed for every dev task
 3. **Use Debug Log**: Enable when troubleshooting story implementation issues
-4. **Version Control core-config.yml**: Track changes to understand project evolution
+4. **Version Control core-config.yaml**: Track changes to understand project evolution
 5. **Document Custom Patterns**: If using custom epicFilePattern, document it
 
 #### Troubleshooting