Record full Google CPU routing regression with independently verified scores

docs/MIXED-QUALITY.md

@@ -1,5 +1,9 @@
 # Mixed retrieval quality checkpoint
 
+This page preserves the pre-routing-fix baseline. The completed
+[0.1.4 regression comparison](MIXED-QUALITY-0.1.4.md) fixes one known code/audio
+routing failure with no scored regression; broader quality gates remain open.
+
 The frozen [mixed diagnostic](../fixtures/mixed/README.md) was executed on
 2026-10-13 with the genuine Google EmbeddingGemma 2 Q8_0 model, the normal
 CPU/Vulkan worker forced to CPU, and the shared CLI/MCP engine. Windows 11 VM;