Record real Google mixed retrieval baseline and remaining quality failures

docs/ROADMAP.md

@@ -214,8 +214,11 @@ Completion requires recorded evidence; targets are not measured results.
   symbols, near-duplicate routines and queries with no relevant implementation.
   - [x] Audit mixed-task routing and eligibility cache behavior; see
     [routing audit](RETRIEVAL-ROUTING.md).
-  - [ ] Complete the frozen mixed baseline, then measure task fusion and cache
-    cost without tuning solely against the diagnostic labels.
+  - [x] Complete the unchanged 32-file/91-query real Google CPU mixed baseline:
+    Code scope 14/14 top-1 versus All files 10/14; all 10 no-answer queries
+    returned candidates. See [mixed quality](MIXED-QUALITY.md).
+  - [ ] Measure task fusion and cache cost against independently reviewed
+    held-out data, preserving the frozen diagnostic for regression comparison.
 - [ ] Validate code search UI interaction on native Windows/macOS/Linux and
   actual GPU hardware. Tiny CPU fixtures do not close those release gates.