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

dist/agents/architect.txt

@@ -120,7 +120,7 @@ Generate documents from templates by EXECUTING (not just reading) embedded instr
 
 ### 0. Check Workflow Plan (if configured)
 
-[[LLM: Check if plan tracking is enabled in core-config.yml]]
+[[LLM: Check if plan tracking is enabled in core-config.yaml]]
 
 - If `workflow.trackProgress: true`, check for active plan using utils#plan-management
 - If plan exists and this document creation is part of the plan:
@@ -1315,7 +1315,7 @@ After presenting the structure, apply `tasks#advanced-elicitation` protocol to r
 {{project-root}}/
 ├── .github/                    # CI/CD workflows
 │   └── workflows/
-│       └── main.yml
+│       └── main.yaml
 ├── .vscode/                    # VSCode settings (optional)
 │   └── settings.json
 ├── build/                      # Compiled output (git-ignored)
@@ -2164,7 +2164,7 @@ Use appropriate format for the chosen API style. If no API (e.g., static site),
 
 ^^CONDITION: has_rest_api^^
 
-```yml
+```yaml
 openapi: 3.0.0
 info:
   title:
@@ -2520,8 +2520,8 @@ After presenting this section, apply `tasks#advanced-elicitation` protocol]]
 {{project-name}}/
 ├── .github/                    # CI/CD workflows
 │   └── workflows/
-│       ├── ci.yml
-│       └── deploy.yml
+│       ├── ci.yaml
+│       └── deploy.yaml
 ├── apps/                       # Application packages
 │   ├── web/                    # Frontend application
 │   │   ├── src/