Prioritize media relevance improvements and refresh scale diagnostic lock

docs/ROADMAP.md

@@ -6,6 +6,16 @@ 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
 large-library checks are deferred follow-up, not blockers for this initial
 release. Keep their evidence and unchecked production gates intact.
+
+Karl's current improvement priority: music relevance, precise spoken-passage
+timestamps and irrelevant results when the requested content is absent. The
+million-record lexical benchmark is deferred while this quality work proceeds.
+Google EmbeddingGemma 2 remains the main text/image/audio/video search model.
+
+- [ ] Evaluate actual whitelisted music metadata as additional Google text evidence, retaining raw audio and real metadata source citations.
+- [ ] Evaluate finer local ASR token/word timing and source-preserving phrase windows with Google text retrieval; preserve every competitor and reject invalid timestamps.
+- [ ] Validate richer no-answer evidence on new independent positive/negative data; do not retune the failed universal cosine cutoff on old held-out results.
+- [ ] Integrate accepted improvements into shared engine/UI/headless clients with verified setup, lifecycle and CPU performance evidence. Diagnostics alone do not raise the media quality rating.
 - [x] Publish v0.1.0 Windows installer/checksum, verify public download bytes,
   install on DEV-WIN11 and leave the app running with a desktop launcher.
 - [x] Publish Windows desktop v0.1.1 with single-instance handling; verify public