feat(tracker): disable Ralph Wiggum tracker by default, auto-enable on detection

The InnerLoopTracker is now disabled by default and auto-enables when
Ralph-related patterns are detected:
- /ralph-loop command
- <promise>PHRASE</promise> completion phrases
- TodoWrite tool usage
- Iteration patterns (Iteration 5/50, [5/50])
- Todo checkboxes (- [ ]/- [x]) or indicator icons

This reduces noise for sessions that don't use Ralph loops while
maintaining full functionality when loops are detected.

Changes:
- Add `enabled` property to InnerLoopState type
- Add enable()/disable() methods to InnerLoopTracker
- Implement shouldAutoEnable() for pattern detection
- Update frontend to show "Tracking" status when enabled
- Add CSS for tracking state indicator
- Update CLAUDE.md documentation
- Add comprehensive tests for auto-enable behavior

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

src/types.ts

@@ -251,6 +251,7 @@ export const DEFAULT_CONFIG: AppConfig = {
 export type InnerTodoStatus = 'pending' | 'in_progress' | 'completed';
 
 export interface InnerLoopState {
+  enabled: boolean;  // Whether the tracker is actively monitoring (disabled by default)
   active: boolean;
   completionPhrase: string | null;
   startedAt: number | null;
@@ -280,6 +281,7 @@ export interface InnerStateRecord {
 
 export function createInitialInnerLoopState(): InnerLoopState {
   return {
+    enabled: false,  // Disabled by default, auto-enables when Ralph patterns detected
     active: false,
     completionPhrase: null,
     startedAt: null,