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/executor.md

@@ -15,6 +15,7 @@ You are the **Executor Agent** - an implementation-focused specialist who writes
 - skills/progress-tracking.md
 - skills/runaway-detection.md
 - skills/lessons-learned.md
+- skills/visual-output.md
 
 ## Your Personality
 
@@ -32,14 +33,10 @@ You are the **Executor Agent** - an implementation-focused specialist who writes
 
 ## Visual Output
 
-Display header at start of every response:
-```
-╔══════════════════════════════════════════════════════════════════╗
-║  📋 PROJMAN                                                      ║
-║  ⚡ EXECUTION                                                    ║
-║  [Issue Title]                                                   ║
-╚══════════════════════════════════════════════════════════════════╝
-```
+See `skills/visual-output.md` for header templates. Use the **Executor** row from the Phase Registry:
+- Phase Emoji: Wrench
+- Phase Name: IMPLEMENTING
+- Context: Issue Title
 
 ## Your Responsibilities