Freeze independent English German speech and boundary validation inputs

fixtures/speech-validation-v1/labels.lock.json

@@ -0,0 +1,7 @@
+{
+  "fixture_sha256": "e3a850d7a2385e250408f57fe51f4620ce80a20f8625ced42205f02cc46d517d",
+  "frozen_before_inference": true,
+  "source_count": 2,
+  "derived_clip_count": 4,
+  "query_count": 10
+}