Stabilize Playwright phase 8 with page smokes and flake fixes.

Direct-navigate Calibrate, harden stub agent timing, and add Emberwake/Seer/Oath smokes so the full 32-spec E2E sweep passes reliably.

server/web/e2e/path-tracer.spec.ts

@@ -4,8 +4,11 @@ import { ensureLiveStubAgent, isLiveStubReady } from './live-stub';
 import { E2E_STUB_AGENT_HOSTNAME, E2E_STUB_AGENT_ID } from './stub-agent';
 
 const SESSION_ID = 'e2e-rs-lanes-sess';
+const PATH_TRACE_API = '**/api/v1/pathtrace/**';
+
 
 test.describe('Path Tracer E2E', () => {
+  let statusReady = false;
   test.beforeAll(async ({ request }) => {
     await ensureLiveStubAgent(request);
   });