refactor: rename CoreComponent to FrameworkDocsComponent and add PM token tracking

## Changes

### Component Renaming (setup/components/)
- Renamed CoreComponent → FrameworkDocsComponent for clarity
- Updated all imports in __init__.py, agents.py, commands.py, mcp_docs.py, modes.py
- Better reflects the actual purpose (framework documentation files)

### PM Agent Enhancement (superclaude/commands/pm.md)
- Added token usage tracking instructions
- PM Agent now reports:
  1. Current token usage from system warnings
  2. Percentage used (e.g., "27% used" for 54K/200K)
  3. Status zone: 🟢 <75% | 🟡 75-85% | 🔴 >85%
- Helps prevent token exhaustion during long sessions

### UI Utilities (setup/utils/ui.py)
- Added new UI utility module for installer
- Provides consistent user interface components

## Benefits
- ✅ Clearer component naming (FrameworkDocs vs Core)
- ✅ PM Agent token awareness for efficiency
- ✅ Better visual feedback with status zones

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

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

setup/components/modes.py

@@ -140,7 +140,7 @@ class ModesComponent(Component):
 
     def get_dependencies(self) -> List[str]:
         """Get dependencies"""
-        return ["core"]
+        return ["framework_docs"]
 
     def _get_source_dir(self) -> Optional[Path]:
         """Get source directory for mode files"""