Record current native Linux desktop release build and loader checks

docs/LINUX-DESKTOP.md

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+# Linux desktop release build evidence
+
+Source: `a6bf091`, desktop 0.1.3, Ubuntu 24.04 WSL x86-64, kernel
+6.18.54.1-microsoft-standard-WSL2, two virtual CPU cores (AMD Ryzen 7 7800X3D).
+
+Locked offline native Cargo release build with `custom-protocol` completed in
+2m54s. The existing Windows-built production frontend was copied into the
+immutable Linux source snapshot; no separate Linux Node build is claimed.
+Verified normal Linux runtime files, decoder resources, licenses and extraction
+helper were prepared before compilation. Release extraction verification passed;
+normal Google runtime validation then passed 20 dependency records.
+
+The executable is 35451968 bytes, SHA-256
+`11cefe0a8ee0f23c7c736d409992b8fe217207c77f934918ccfbf2c8ed1089c4`.
+`ldd` resolved 130 library lines with no missing dependencies on this machine.
+The vendored reviewed GLib dependency emitted 34 known compiler warnings; this
+is not a strict Linux Clippy result. No GPU/model inference was executed here.
+
+Raw build target: `/home/karl/.cache/searchi-validation/desktop-target/release/searchi-desktop`.
+Immutable source: `/home/karl/.cache/searchi-validation/linux-desktop-a6bf091`.
+
+This proves native compilation and local loader dependency resolution, not
+native UI interaction, runtime resource discovery, clean-machine deployment,
+installer packaging, Wayland shortcut operation or broad Linux compatibility.
+No Linux desktop download is published. Native graphical checks remain open.