fix(quick-dev): remove redundant H1 title from spec template (#2111)

The frontmatter `title` field is the single source of truth.
The duplicate `# {title}` H1 heading was redundant and has been removed.

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

src/bmm-skills/4-implementation/bmad-quick-dev/spec-template.md

@@ -11,8 +11,6 @@ context: [] # optional: max 3 project-wide standards/docs. NO source code files.
      Cohesive cross-layer stories (DB+BE+UI) stay in ONE file.
      IMPORTANT: Remove all HTML comments when filling this template. -->
 
-# {title}
-
 <frozen-after-approval reason="human-owned intent — do not modify unless human renegotiates">
 
 ## Intent