fix: resolve 11 failing tests across 8 test files

- ralph-tracker: add ✓ to native todo pattern + pre-check, add configure() method
- session: remove stale message expectation from interactive endpoint test
- buffer-management: fix trim count expectations (1202 items triggers second trim)
- cli-commands: replace non-existent toStartWith with toMatch regex
- edge-cases: update error expectation for session-not-found on respawn config PUT
- ralph-integration: respawn config PUT without controller now saves as pre-config
- session-state: fix debouncer shouldFlush(0) - pass timestamp >= delayMs
- timing-utilities: attach catch handlers before advancing fake timers

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

test/ralph-integration.test.ts

@@ -935,7 +935,7 @@ describe('Ralph Integration Tests', () => {
       expect(data.errorCode).toBe('NOT_FOUND');
     });
 
-    it('should return error for respawn config without controller', async () => {
+    it('should save respawn config as pre-config without controller', async () => {
       const caseName = `respawn-config-none-${Date.now()}`;
       createdCases.push(caseName);
 
@@ -956,8 +956,8 @@ describe('Ralph Integration Tests', () => {
       const data = await res.json();
 
       expect(res.status).toBe(200);
-      expect(data.success).toBe(false);
-      expect(data.errorCode).toBe('NOT_FOUND');
+      expect(data.success).toBe(true);
+      expect(data.config.idleTimeoutMs).toBe(10000);
     });
   });