Preserve fractional-millisecond decoder evidence in timing evaluator

tools/speech-eval/native-validation/README.md

@@ -138,3 +138,17 @@ missing source windows prohibit numeric accepted timing scores. Historical
 full-source gated DTW **6/8** is context, never an inherited result or an isolated
 causal comparison with this end-to-end hybrid run. No new timing score exists
 until this exact mode executes and all checks finish.
+
+The first attempt at `.searchi/qa/speech-live-timing-v1` failed during source
+preflight, before any model load or inference. Its immutable `failure.json`
+SHA-256 is `9ba49fd5cdb69e57c267f579818f226949b02eafbc0e592161fad7593f00c6aa`.
+The bark recording lasts 2.038594 seconds: its rounded 2039 ms window implies
+32624 samples, while aligned decoding correctly retains 32618 real samples.
+The six-sample difference is 0.375 ms. The evaluator now accepts the existing
+one-millisecond coverage bound (16 samples), without padding, trimming or
+changing source bytes, labels, ranking, or DTW points. Its regression test
+accepts that real tail and rejects a 17-sample discrepancy and invalid bounds.
+Seven Rust tests, strict all-target Clippy and five timing-adapter tests passed.
+A retry must use a fresh output directory after the corrected evaluator is
+frozen and the CPU inference slot is granted again; the failed attempt remains
+preserved and has no quality score.