chore(yaml): enforce .yaml extension and prefer double quotes in YAML via eslint-plugin-yml; fix rule name; format repo

dist/agents/qa.txt

@@ -1743,7 +1743,7 @@ template:
   output:
     format: markdown
     filename: docs/stories/{{epic_num}}.{{story_num}}.{{story_title_short}}.md
-    title: "Story {{epic_num}}.{{story_num}}: {{story_title_short}}"
+    title: 'Story {{epic_num}}.{{story_num}}: {{story_title_short}}'
 
 workflow:
   mode: interactive
@@ -1845,7 +1845,7 @@ sections:
     sections:
       - id: agent-model
         title: Agent Model Used
-        template: "{{agent_model_name_version}}"
+        template: '{{agent_model_name_version}}'
         instruction: Record the specific AI agent model and version used for development
         owner: dev-agent
         editors: [dev-agent]
@@ -1883,16 +1883,16 @@ template:
   output:
     format: yaml
     filename: docs/qa/gates/{{epic_num}}.{{story_num}}-{{story_slug}}.yml
-    title: "Quality Gate: {{epic_num}}.{{story_num}}"
+    title: 'Quality Gate: {{epic_num}}.{{story_num}}'
 
 # Required fields (keep these first)
 schema: 1
-story: "{{epic_num}}.{{story_num}}"
-story_title: "{{story_title}}"
-gate: "{{gate_status}}" # PASS|CONCERNS|FAIL|WAIVED
-status_reason: "{{status_reason}}" # 1-2 sentence summary of why this gate decision
-reviewer: "Quinn (Test Architect)"
-updated: "{{iso_timestamp}}"
+story: '{{epic_num}}.{{story_num}}'
+story_title: '{{story_title}}'
+gate: '{{gate_status}}' # PASS|CONCERNS|FAIL|WAIVED
+status_reason: '{{status_reason}}' # 1-2 sentence summary of why this gate decision
+reviewer: 'Quinn (Test Architect)'
+updated: '{{iso_timestamp}}'
 
 # Always present but only active when WAIVED
 waiver: { active: false }