fix(skill): remove workflow metadata and normalize exec for bmad-quick-dev-new-preview

Remove name/description from workflow.md frontmatter (belongs in SKILL.md).
Normalize quick-flow-solo-dev agent exec from path-based to skill:bmad-quick-dev-new-preview.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/bmm/agents/quick-flow-solo-dev.agent.yaml

@@ -28,7 +28,7 @@ agent:
       description: "[QD] Quick-flow Develop: Implement a story tech spec end-to-end (Core of Quick Flow)"
 
     - trigger: QQ or fuzzy match on bmad-quick-dev-new-preview
-      exec: "{project-root}/_bmad/bmm/workflows/bmad-quick-flow/bmad-quick-dev-new-preview/workflow.md"
+      exec: "skill:bmad-quick-dev-new-preview"
       description: "[QQ] Quick Dev New (Preview): Unified quick flow — clarify intent, plan, implement, review, present (experimental)"
 
     - trigger: CR or fuzzy match on code-review

src/bmm/workflows/bmad-quick-flow/bmad-quick-dev-new-preview/workflow.md

@@ -1,6 +1,4 @@
 ---
-name: bmad-quick-dev-new-preview
-description: 'Implements any user intent, requirement, story, bug fix or change request by producing clean working code artifacts that follow the project''s existing architecture, patterns and conventions. Use when the user wants to build, fix, tweak, refactor, add or modify any code, component or feature.'
 main_config: '{project-root}/_bmad/bmm/config.yaml'
 ---