Coordinate foreground search and background inference CPU budgets

docs/ROADMAP.md

@@ -164,6 +164,11 @@ Audit and measured priorities: [EMBEDDINGGEMMA2-AUDIT.md](EMBEDDINGGEMMA2-AUDIT.
   See [INCREMENTAL-SEMANTIC.md](INCREMENTAL-SEMANTIC.md).
 - [ ] Benchmark genuine token-budgeted multi-sequence batching and isolation.
 - [ ] Implement and measure shared foreground/indexer resource budgets/priority.
+  - [x] Shared inference admission, foreground priority between background
+    encodes, total-thread settings migration and retained warm sessions on save
+    failure; real Google CPU overlap regression passed on Windows.
+  - [ ] Measure representative mixed-media contention, single-thread latency,
+    extraction/decoder/ANN work and native UI p95 before closing this gate.
 - [ ] Attribute startup cost; measure smaller query context and selective encoders.
 - [ ] Buffered bounded media IPC and linear UTF-8 source-window offset processing.
 - [ ] Evaluate 256d MRL and content-specific vision budgets on independent data.