Record full Google CPU routing regression with independently verified scores

docs/MEDIA-QUALITY.md

@@ -90,6 +90,14 @@ The existing **20-document/24-query synthetic regression** was rerun with the ac
 
 Measured hybrid p95 was **146.83 ms** on this run. [Recorded output](../fixtures/media/document-baseline.json). This remains a synthetic seed, not independent production-quality evidence or a large-corpus performance claim.
 
+## Current mixed regression follow-up
+
+The completed [0.1.4 mixed regression](MIXED-QUALITY-0.1.4.md) retains the known
+file-level media outcomes with no scored regression: image top-1 24/24, video
+file identity 22/22, music 2/4 and sound 4/4. Its one improvement concerns a
+code/audio routing query. It does not rescore precise speech timestamps or add
+independent media labels, so the experimental media rating remains 4/10.
+
 ## Scoring and release gates
 
 ### Local recognized-speech supplement: actual Google diagnostic