[testnet] Shear wallet 0.6
Shear wallet 0.6. First run sets a password of at least eight characters; that password encrypts shewall.bin and is required on every later run and on import. Biometrics are optional on-device only. Closure Export writes a user-visible shewall.bin: desktop save dialog does not pass bytes (file_picker 8.x throws on macOS) and always overwrites the picked path; Android/iOS pass bytes for SAF. Import is on the lock gate and Closure.
Mac DMG is Developer ID signed, notarized, and stapled. Android APK includes INTERNET and USE_BIOMETRIC; MainActivity is FlutterFragmentActivity.
Windows leftover: attach shear-wallet-0.6-windows.zip (Flutter shear_wallet.exe, no miner inside, title Shear 0.6) plus Linux shear-wallet-0.6-linux.zip and Arch shear-wallet-0.6-archlinux.zip (pkgver=0.6) to this same 0.6 tag. Flutter file version 0.6.0+18 is not the pin.
Do not recut wallet 0.5 / 0.4 or miner 1.1 / 1.0. No iOS.