Freeze independent DTW speech timing diagnostic and startup provenance

tools/speech-rank/README.md

@@ -75,3 +75,11 @@ use the existing executable command with input
 `.searchi/speech/base-token-sentences-v1.json` and a new output filename, then the
 same frozen eight-query scorer. Do not overwrite old results or select passages
 with relevance labels.
+
+The separate `dtw-token-sentences-v1` experiment independently validates native
+DTW centisecond points and uses the first/last token points as approximate
+sentence spans. These are not token durations. Ordinary interval failures remain
+in the embedded ASR evidence and are independently checked; they do not authorize
+fabricating or clamping DTW points. Missing/invalid DTW points exclude a window
+and prevent accepted scoring. Use a separate DTW report/output and retain the
+failed ordinary-v1 run. The frozen five sources/eight queries remain unchanged.