Record Linux native preview and desktop suite results

docs/MEDIA-PREVIEW.md

@@ -47,3 +47,25 @@ These checks do not prove WebView playback or macOS/Linux protocol behavior.
 The locked native suite, strict all-target Clippy and Rust formatting checks
 passed after the final native edits. No model inference or GPU test was needed
 for these protocol regressions.
+
+## Linux CPU structural validation
+
+Ubuntu 24.04 WSL compiled the immutable `370db7e` Git snapshot with the locked
+dependencies and `SEARCHI_FORCE_CPU=1`. All nine preview tests passed in 0.73 s;
+the complete native desktop suite then passed 45/45 in 2.78 s, with no skips.
+The native source tree remains identical to that snapshot; subsequent commits
+changed frontend retry behavior only. Compilation took 8m 18s after missing
+locked dependencies were fetched. An initial offline attempt could not resolve
+the uncached Single-Instance plugin; it was not a product test failure.
+
+Retained logs and SHA-256:
+
+- `/home/karl/.cache/searchi-validation/preview-linux-370db7e-online.log`:
+  `850ea891adb3fdce2735801d1c9ce5e4712f2ff9fbc4013cec6cfd9698fb7594`.
+- `/home/karl/.cache/searchi-validation/desktop-linux-370db7e-tests.log`:
+  `019479389b90cc74b02fbc15ecb7fb1cc99ea6c9b28edae240caeca3473d2f5b`.
+
+The existing vendored GLib code emitted 34 compiler warnings. This was a debug
+Rust test build, not strict Linux Clippy, a packaged desktop launch, WebKit
+playback, GPU inference or macOS validation. No model inference was executed.
+Native custom-protocol playback and seeking remain open on all release systems.