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/web/public/styles.css

@@ -556,6 +556,10 @@ body {
   background: var(--green);
 }
 
+.ralph-status-badge.tracking .ralph-status-dot {
+  background: var(--yellow);
+}
+
 @keyframes ralph-pulse {
   0%, 100% { opacity: 1; transform: scale(1); }
   50% { opacity: 0.6; transform: scale(1.2); }