- Add build-android-arm64, build-launcher-android-arm64, build-all-android
targets to Makefile and web/Makefile
- Use -tags stdjson (no goolm) for Android; CGO_ENABLED=0 throughout
- Output staged as build/android-staging/arm64-v8a/libpicoclaw{,-web}.so
for JNI consumption; zip packaging handled by CI
- Exclude Matrix channel from android builds (channel_matrix.go) to avoid
modernc.org/sqlite CGO dependency
- Exclude systray from android builds; use headless stub instead
(systray.go / systray_stub_nocgo.go)
Exclude the Matrix gateway shim from freebsd/arm builds because
modernc.org/libc currently fails to compile on that target.
Document the upstream 32-bit FreeBSD codegen mismatch as well.
sky5454