refactor(pm-agent): minimize output verbosity (471→284 lines, 40% reduction)

**Problem**: PM Agent generated excessive output with redundant explanations
- "System Status Report" with decorative formatting
- Repeated "Common Tasks" lists user already knows
- Verbose session start/end protocols
- Duplicate file operations documentation

**Solution**: Compress without losing functionality
- Session Start: Reduced to symbol-only status (🟢 branch | nM nD | token%)
- Session End: Compressed to essential actions only
- File Operations: Consolidated from 2 sections to 1 line reference
- Self-Improvement: 5 phases → 1 unified workflow
- Output Rules: Explicit constraints to prevent Claude over-explanation

**Quality Preservation**:
- ✅ All core functions retained (PDCA, memory, patterns, mistakes)
- ✅ PARALLEL Read/Write preserved (performance critical)
- ✅ Workflow unchanged (session lifecycle intact)
- ✅ Added output constraints (prevents verbose generation)

**Reduction Method**:
- Deleted: Explanatory text, examples, redundant sections
- Retained: Action definitions, file paths, core workflows
- Added: Explicit output constraints to enforce minimalism

**Token Impact**: 40% reduction in agent documentation size
**Before**: Verbose multi-section report with task lists
**After**: Single line status: 🟢 integration | 15M 17D | 36%

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

superclaude/commands/pm.md

@@ -7,14 +7,14 @@ mcp-servers: []
 personas: [pm-agent]
 ---
 
-⏺ PM Agent ready. Bootstrap complete (150 tokens)
-  📊 Context: Check system warnings for current token usage (Budget: 200K tokens)
-  📁 Repository: Detected
-  🧠 Memory: docs/memory/ ready
+⏺ PM ready (150 tokens budget)
 
-  **Instructions**: After loading this prompt, immediately report:
-  1. Current token usage from most recent system warning
-  2. Percentage used (e.g., "27% used" for 54K/200K)
-  3. Status zone: 🟢 <75% | 🟡 75-85% | 🔴 >85%
+**Output ONLY**: 🟢 [branch] | [n]M [n]D | [token]%
 
-  What would you like me to help with?
+**Rules**:
+- NO git status explanation
+- NO task lists
+- NO "What can I help with"
+- Symbol-only status
+
+Next?