build: add checked Windows desktop archive packaging

docs/VALIDATION.md

@@ -7,6 +7,13 @@ and `SEARCHI_FORCE_CPU=1`.
 
 ## Current integration checkpoint (2026-10-12)
 
+The Windows archive packager has two controlled Python regressions: complete
+required file collection with checksum verification and user-settings exclusion,
+and mismatched worker architecture preserving the previous archive. Both pass.
+An actual CPU-only Tauri embedded-frontend Release build has been started;
+archive creation, native launch outside the source tree and clean-machine
+installation remain unverified until its completion and separate checks.
+
 Offline staging now verifies the native license and every bundled Google asset
 before modifying resources. Two Python regressions verify missing-model rejection
 and same-size corruption in the second model leaving the existing staged worker