refactor: rename inner-loop-tracker to ralph-tracker with API improvements

- Rename inner-loop-tracker.ts → ralph-tracker.ts throughout codebase
- Add ralph-config.ts for parsing .claude/ralph-loop.local.md config
- Standardize API error responses using createErrorResponse()
- Add input validation for auto-compact/auto-clear thresholds
- Update UI labels to "Ralph / Todo Tracker" consistently
- Add 46 integration tests for Ralph tracking functionality
- Update test badge to 438 total tests

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

src/screen-manager.ts

@@ -588,11 +588,11 @@ export class ScreenManager extends EventEmitter {
     }
   }
 
-  // Update inner loop (Ralph Wiggum) enabled state
-  updateInnerLoopEnabled(sessionId: string, enabled: boolean): void {
+  // Update Ralph enabled state
+  updateRalphEnabled(sessionId: string, enabled: boolean): void {
     const screen = this.screens.get(sessionId);
     if (screen) {
-      screen.innerLoopEnabled = enabled;
+      screen.ralphEnabled = enabled;
       this.saveScreens();
     }
   }