Freeze independent DTW speech timing diagnostic and startup provenance

tools/speech-eval/test_contract.py

@@ -6,11 +6,24 @@ import tempfile
 import sys
 import os
 import wave
+import importlib.util
+import hashlib
 from run import segments, run_owned, recognized_window, decode_command, decoded_frames, primary_audio_range
 from score import score, require_eligible
 
 
 class ContractTests(unittest.TestCase):
+    def test_harness_source_hash_is_captured_before_file_changes(self):
+        with tempfile.TemporaryDirectory() as directory:
+            path = Path(directory) / "run-copy.py"
+            original = Path(__file__).with_name("run.py").read_bytes()
+            path.write_bytes(original)
+            spec = importlib.util.spec_from_file_location("speech_start_hash_test", path)
+            module = importlib.util.module_from_spec(spec)
+            spec.loader.exec_module(module)
+            path.write_bytes(original + b"\n# changed after startup\n")
+            self.assertEqual(module.HARNESS_SHA256_AT_START, hashlib.sha256(original).hexdigest())
+            self.assertNotEqual(module.HARNESS_SHA256_AT_START, module.sha256(path))
     def test_scoring_rejects_incomplete_or_reduced_pool(self):
         for report in [{}, {"complete": False, "quality_score_eligible": True},
                        {"complete": True, "quality_score_eligible": False},