Freeze independent DTW speech timing diagnostic and startup provenance

tools/speech-eval/README.md

@@ -89,3 +89,31 @@ Run only with the coordinator's available CPU inference slot. The previous
 base-only run took about 251 seconds including decode/process startup. Token
 alignment has not yet been timed; each ASR process retains the 600-second limit.
 No production behavior or quality claim follows from structural tests.
+
+## Separate DTW point-span comparison
+
+`dtw-policy.json` freezes a separate base experiment. Replace `--token-sentences`
+with `--dtw-sentences` and use a new output such as
+`.searchi/speech/base-dtw-sentences-v1.json`. This adds `--dtw base
+--no-flash-attn`: the pinned runtime disables DTW when flash attention is on.
+Native `t_dtw` is a centisecond point, approximately the moment a token is output,
+not a start/end interval. Multiply by ten; first and last ordinary-token points
+define an approximate sentence point span. One-token sentences can have zero span.
+Only source-window-bounded globally monotonic integer points are accepted.
+Original ordinary interval errors are retained separately and never repaired.
+Missing/invalid DTW points invalidate accepted scoring for the new comparison.
+Frozen ordinary-v1 output remains failed and unchanged.
+
+Pinned native default DTW graph workspace is 128 MiB; this is additional workspace,
+not a total memory ceiling. Attention storage and disabled flash attention can
+increase memory/time. Input remains 30 seconds, one CPU thread, 4 MiB output,
+4096 tokens/segment and 600 seconds/process; observed peak memory/runtime must
+be measured before production use. No inference has established this policy.
+Future harness reports capture the executing-source SHA at startup and preload
+alignment helpers before processing. The first ordinary-v1 run read its harness
+SHA at completion while the on-disk harness had changed; that field cannot prove
+the exact executing harness bytes. Its original raw token failures remain valid
+diagnostic observations, and its excluded window already prohibits an accepted
+quality score. Preserve that historical limitation instead of rewriting output.
+References: pinned [token data/API](https://github.com/ggml-org/whisper.cpp/blob/d1be6fde11ac6e0407606b4e42fe72d34add8037/include/whisper.h)
+and [DTW implementation](https://github.com/ggml-org/whisper.cpp/blob/d1be6fde11ac6e0407606b4e42fe72d34add8037/src/whisper.cpp).