Document published Windows 0.1.3 update

docs/WINDOWS-0.1.3.md

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+# Windows 0.1.3
+
+Published unsigned preview from source `3bf95583533ce44021c8ecd9733f32062488976e`.
+Production frontend and NSIS build passed; 60 frontend tests passed.
+The installer contains the verified extraction helper. Genuine PDF indexing
+passed through that extracted helper (0.33 s). The preceding desktop run passed
+46 native tests. VM checks used CPU only.
+
+Installer: 100462955 bytes, SHA-256
+`5c9504366fc95dd952c219e4a59516dad26df0167f41b42269deef3fe6310911`.
+Public unauthenticated full installer and checksum downloads matched local bytes.
+Existing user installation was not modified. Clean-machine installation, upgrade,
+native UI media playback and physical GPU tests remain open.