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/edge-cases.test.ts

@@ -224,7 +224,7 @@ describe('Edge Cases and Error Handling', () => {
       expect(data.error).toBe('Respawn controller not found');
     });
 
-    it('should handle updating config on non-existent respawn controller', async () => {
+    it('should handle updating config on non-existent session', async () => {
       const response = await fetch(`${baseUrl}/api/sessions/non-existent/respawn/config`, {
         method: 'PUT',
         headers: { 'Content-Type': 'application/json' },
@@ -232,7 +232,7 @@ describe('Edge Cases and Error Handling', () => {
       });
       const data = await response.json();
 
-      expect(data.error).toBe('Respawn controller not found');
+      expect(data.error).toBe('Session not found');
     });
   });