feat: add Google code retrieval across desktop CLI and MCP

docs/VALIDATION.md

@@ -7,10 +7,10 @@ and `SEARCHI_FORCE_CPU=1`.
 
 ## Current integration checkpoint (2026-10-12)
 
-- Native desktop: **13/13 tests passed**, including structured trace/basic responses
+- Native desktop: **15/15 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: **36/36 tests passed**, TypeScript/Vite production build and
+  Frontend: **39/39 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
@@ -128,6 +128,19 @@ agent execution and release packaging remain open gates.
 
 ## Historical evidence
 
+The source-code checkpoint uses the actual rebuilt/staged CPU Google worker:
+9/9 frozen code queries rank their expected source file first (1/9 with lexical
+retrieval alone), with exact MCP source excerpts and exclusion of a matching
+ordinary document. This is a tiny synthetic regression, not a general code
+benchmark. [Protocol and raw results](CODE-QUALITY.md).
+Workspace checks passed 84 default tests; model/decoder/resource checks remain
+opt-in. Separate actual CPU code tests verify task/debug vector behavior and
+normalized-tokenizer source windows, including long Unicode code. The capture
+backend's three tests, frontend build/format and strict Rust Clippy also pass.
+Existing real Google text-reference and long-tail parity passed after the
+tokenizer fix; regular document search retains its pinned reference behavior.
+Native/GPU/platform and broad independent code-quality gates remain open.
+
 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