feat: enhance low signal transcript handling with finalization checks and logging

tests/test_ai_voice_media_runtime.py

@@ -1248,9 +1248,17 @@ def test_media_runtime_voice_v2_emits_blind_ack_on_first_turn_without_partial_si
 
 
 def test_media_runtime_low_signal_filter_catches_short_asr_noise():
-    assert AudioSocketMediaRuntime._is_low_signal_transcript("Давай")
-    assert AudioSocketMediaRuntime._is_low_signal_transcript("твой")
-    assert AudioSocketMediaRuntime._is_low_signal_transcript("Поргай, что это")
+    assert AudioSocketMediaRuntime._is_low_signal_partial_transcript("Давай")
+    assert AudioSocketMediaRuntime._is_low_signal_partial_transcript("твой")
+    assert AudioSocketMediaRuntime._is_low_signal_partial_transcript("Поргай, что это")
+    assert AudioSocketMediaRuntime._is_low_signal_final_transcript("твой")
+    assert AudioSocketMediaRuntime._is_low_signal_final_transcript("Поргай, что это")
+
+
+def test_media_runtime_final_low_signal_filter_keeps_real_answers():
+    # A finalized "да"/"нет"/etc. is a real answer, not noise — must not be silently dropped.
+    for real_answer in ("Да", "Нет", "Хорошо", "Ладно", "Давай", "Привет"):
+        assert not AudioSocketMediaRuntime._is_low_signal_final_transcript(real_answer)
 
 
 def test_media_runtime_ignores_low_signal_utterance_without_ack_or_turn():