Fix admission tick tests for per-model admission

The admission tick now iterates per registered model, so tests that
asserted admitted: 1 received 2 (one per model). Default the test
helper to a single model so the existing assertions stay crisp and
won't drift as more production models are added.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: jahooma

web/src/server/free-session/__tests__/admission.test.ts

@@ -28,6 +28,9 @@ function makeAdmissionDeps(overrides: Partial<AdmissionDeps> = {}): AdmissionDep
     sessionLengthMs: 60 * 60 * 1000,
     graceMs: 30 * 60 * 1000,
     now: () => NOW,
+    // Default to a single model so per-tick assertions (admitted: 1) stay
+    // crisp regardless of how many production models are registered.
+    models: ['test-model'],
     ...overrides,
   }
   return deps