fix: ensure emotive ack rotation and prebaked ack caching apply outside v2 queue eligibility

tests/test_ai_voice_runtime_service.py

@@ -859,11 +859,14 @@ def test_push_voice_ai_telephony_event_call_ended_returns_detached_safe_payload(
 
 def test_media_registration_emotive_ack_rotation_is_not_gated_on_v2_queue_eligibility(monkeypatch):
     # AI_VOICE_V2_QUEUE_CODES defaults to "voice_lab_ai" only, so a queue outside
-    # that allowlist runs the plain v1 ack path. Emotive-ack rotation must still
-    # apply there — otherwise every filler collapses to the single fixed
-    # "Секунду." fallback string instead of rotating through phrase variants.
+    # that allowlist runs the plain v1 ack path. Emotive-ack rotation and prebaked-ack
+    # caching must still apply there — otherwise every filler collapses to the single
+    # fixed "Секунду." fallback string instead of rotating, and gets synthesized live
+    # via ElevenLabs each time instead of served from the pre-cached ack bank, adding
+    # real TTS round-trip time to the one phrase whose job is to hide that latency.
     monkeypatch.delenv("AI_VOICE_V2_QUEUE_CODES", raising=False)
     monkeypatch.delenv("AI_VOICE_V2_EMOTIVE_ACK_ENABLED", raising=False)
+    monkeypatch.delenv("AI_VOICE_V2_PREBAKED_ACK_ENABLED", raising=False)
     row = VoiceAISessionRow(
         session_id="avs_runtime_emotive_ack_v1",
         call_id="call_runtime_emotive_ack_v1",
@@ -879,3 +882,4 @@ def test_media_registration_emotive_ack_rotation_is_not_gated_on_v2_queue_eligib
 
     assert registration.voice_v2_enabled is False
     assert registration.voice_v2_emotive_ack is True
+    assert registration.voice_v2_prebaked_ack is True