Document the multi-remote release, publish matching store metadata,
and advance the version once from the released 0.1.3 base.

Support Alpine/musl and Debian/glibc hosts, lock downloaded and
Gradle artifacts, and verify native and APK security properties.

versionCode 4. Bound the SSH handshake so a stalled server cannot hang
a sync. Persist config, key, and host pin atomically so an interrupted
write cannot corrupt state. Replace the chained one-time jobs with
periodic work that survives reboots; the schedule floor is now
WorkManager's 15-minute minimum.

Checksum-pin every downloaded toolchain archive. Before publishing,
verify the APK was built from HEAD, the tag matches versionName,
apksigner passes, and the tree is clean; publish a sha256 sidecar
and treat published assets as immutable. Compare full unsigned APKs
in verify-repro and run the Android unit tests in CI.

versionCode 3. Drop --mkpath so remotes with an rsync older than 3.2.3
(stock macOS included) can receive syncs; rsync still creates the final
remote path component on its own. NDK host toolchain detection so the
native build also runs on macOS hosts.

versionCode 2. Empty-path and config-corruption fixes, rsync process
cleanup on stopped syncs, keygen error reporting, and the store icon.

A small Android app for one-way folder backup, a KISS alternative to
Syncthing. It bundles rsync (built from pinned source via the NDK) and
a pure-Go SSH transport, both shipped in the APK as lib*.so and run from
the native library directory.

rsend pins the host key, stores the ed25519 identity Keystore-encrypted,
pushes each folder additively or as a mirror, and runs on demand or on a
WiFi-only schedule. The build is self-contained and reproducible: make
setup provisions the toolchain, make builds rsync, rsh, and the APK.