Prevent duplicate desktop model sessions and record calibration evidence

docs/ROADMAP.md

@@ -1,6 +1,6 @@
 # Production readiness roadmap
 
-Status: implementation started; no production release yet. Windows VM tests use CPU only.
+Status: initial Windows v0.1.0 published and installed; broader production gates remain open. Windows VM tests use CPU only.
 
 Karl's release priority, 2026-10-13: publish a usable first Windows version and
 install it on DEV-WIN11 now. Extensive platform/GPU, clean-machine, signing and
@@ -43,6 +43,9 @@ release. Keep their evidence and unchecked production gates intact.
   see [incremental semantic design](INCREMENTAL-SEMANTIC.md).
 
 ## 3. Desktop
+- [x] Official single-instance transport with isolated explicit profiles;
+  Windows CPU duplicate launch exits without a second query worker.
+  See [launch evidence](SINGLE-INSTANCE.md); visual focus and other OS checks remain open.
 - [x] Persisted solid/glass/frosted appearance and bounded background tint;
   opaque reading surfaces, serialized settings updates and high-contrast fallback.
 - [ ] Verify native glass visually on Windows 11 22H2+; macOS/Linux currently
@@ -250,7 +253,9 @@ Completion requires recorded evidence; targets are not measured results.
       after independent AI review; verify exact Git-preserved source/label bytes.
     - [x] Add a shared-engine calibration-only runner retaining raw cosine,
       lexical provenance, hybrid ranks and atomic incomplete evidence.
-    - [ ] Execute calibration, freeze the proposed relevance policy, then
+    - [x] Execute the frozen calibration-only baseline with genuine Google CPU
+      inference; preserve raw results and leave held-out requests unevaluated.
+    - [ ] Freeze the proposed relevance policy, then
       evaluate held-out queries without tuning against their results.
   - [x] Explicit English/German code intent vetoes exclusive audio routing;
     actual Google CPU regression preserves code among qualifying audio candidates.