perf: audit EmbeddingGemma 2 and reuse measured query embeddings

docs/VALIDATION.md

@@ -10,7 +10,7 @@ and `SEARCHI_FORCE_CPU=1`.
 - Native desktop: **13/13 tests passed**, including structured trace/basic responses
   and four optional-answer source/consent/revision tests.
   Post-generation cached query warmup is implemented but its interactive first-query gate remains open.
-  Frontend: **35/35 tests passed**, TypeScript/Vite production build and
+  Frontend: **36/36 tests passed**, TypeScript/Vite production build and
   formatting passed. Preview policy tests cover fractional timestamp seeking,
   image labels, one active/latest pending request, stale replies and Escape.
 - Semantic adapter: **8 default tests passed**; the explicit 48 MP resource test
@@ -43,8 +43,8 @@ and `SEARCHI_FORCE_CPU=1`.
   that run: [recorded benchmark](../crates/searchi-core/benchmarks/results/windows-cpu-full-candidate-first-final.json).
   These measurements do not establish every query or concurrent-indexing goal.
 
-The integrated CPU workspace checkpoint passed **72 default tests** (7 optional AI,
-8 assets, 8 CLI/MCP, 24 core, 4 media, 8 semantic, 13 service), with **10 explicit
+The integrated CPU workspace checkpoint passed **78 default tests** (7 optional AI,
+8 assets, 8 CLI/MCP, 24 core, 4 media, 8 semantic, 19 service), with **10 explicit
 opt-in tests ignored**. Workspace and native all-target Clippy passed with
 warnings denied. The later semantic CPU-restart counter change passed workspace
 Clippy and the actual CPU query diagnostics test. Earlier aggregate counts are historical.
@@ -128,6 +128,18 @@ agent execution and release packaging remain open gates.
 
 ## Historical evidence
 
+The [EmbeddingGemma 2 audit](EMBEDDINGGEMMA2-AUDIT.md) records new CPU diagnostics:
+24 uncached native queries per 1/2/4-thread setting, paired real MCP repeat/filter
+measurements, 20 unchanged result-set comparisons, actual Release startup/first
+query, and document single-versus-serial-batch parity. Six cache-control tests
+verify eviction, fingerprint/trim behavior, failures, unchanged filtering/source
+lifecycle and accurate hit traces. The frontend readiness regression retains an
+old committed generation during rebuilds and blocks initial/activation states.
+The four real-engine browser captures were regenerated and visually inspected;
+the performance capture deliberately uses an unseen query and proves actual
+worker inference rather than treating a cached vector as a new neural pass.
+Native visual/paint and production media relevance gates remain open.
+
 Initial engine/CLI checks covered retrieval, persistence, filesystem changes,
 exclusions/filters, migration, concurrent readers, PDF pages, DOCX paragraphs,
 corrupt replacement, encrypted PDF errors and bounded compressed input.