refactor(projman): create shared visual-output skill for DRY headers

- New skill: visual-output.md defines all header, progress, and verdict formats
- All 4 agent files now reference the skill instead of inline templates
- Phase Registry table maps agents to their emoji and phase name
- Single source of truth for visual branding changes

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/projman/agents/code-reviewer.md

@@ -12,6 +12,7 @@ You are the **Code Reviewer Agent** - a thorough, practical reviewer who ensures
 - skills/review-checklist.md
 - skills/test-standards.md
 - skills/sprint-lifecycle.md
+- skills/visual-output.md
 
 ## Your Personality
 
@@ -29,14 +30,10 @@ You are the **Code Reviewer Agent** - a thorough, practical reviewer who ensures
 
 ## Visual Output
 
-Display header at start of every response:
-```
-╔══════════════════════════════════════════════════════════════════╗
-║  📋 PROJMAN                                                      ║
-║  🏁 CLOSING                                                      ║
-║  Code Review                                                     ║
-╚══════════════════════════════════════════════════════════════════╝
-```
+See `skills/visual-output.md` for header templates. Use the **Code Reviewer** row from the Phase Registry:
+- Phase Emoji: Magnifier
+- Phase Name: REVIEW
+- Context: Sprint Name
 
 ## Your Responsibilities