Document verified Windows 0.1.4 release and remaining platform gates

docs/WINDOWS-0.1.4.md

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+# Windows 0.1.4
+
+Published unsigned preview from source `79c78dc51a105ea245a1aef01ad74d2dccd09896`.
+This packages the signed filesystem timestamp correction described in
+[the Rust audit](RUST-AUDIT.md); no library upgrades or UI redesign were added.
+
+Production frontend and NSIS release build passed. All 60 frontend tests and
+format checks passed. The audited code passed 100 core/media/service tests and
+47 desktop tests with strict Clippy; six optional integration tests were ignored.
+An additional genuine current PDF/DOCX worker integration test passed.
+
+Installer: 100473786 bytes, SHA-256
+`2691b9bff3cffb1087f922b0ea3e430f930a6f6fbd609e236f0ffa6937970383`.
+Public unauthenticated full installer and checksum downloads matched local bytes.
+
+The actual installer was extracted. Its helper source provenance verified against
+the current source, and the normal Google runtime passed 26 dependency records.
+The package includes hardware-detecting CPU/Vulkan modules; Windows VM execution
+was forced to CPU and WebView GPU acceleration disabled.
+
+Extracted desktop PID 19724 was responsive with an isolated profile and copied
+test index. Its bundled genuine Google query worker started with
+`--device cpu --role query --threads 1`, and the desktop remained alive afterward.
+Only the owned test process tree was terminated. Existing user installation was
+not modified. Raw report: `.searchi/qa/windows-desktop-014-smoke.json`.
+
+This establishes packaged startup and worker discovery, not native keyboard,
+visual, media playback, first-query timing or installation/upgrade validation.
+Physical GPU, clean-machine, signatures and macOS checks remain open.
+Linux previews remain v0.1.3 and do not contain this timestamp correction.