Vendor the pinned Rustix package with an Android-only weak libc lookup so missing statx returns ENOSYS and uses the existing stat64 fallback. Add an isolated Android smoke test with a hidden symbol and a seccomp filter that kills raw statx probes.
Verified 177 workspace tests, host Clippy, and ARM64 Android sandbox smoke test. ARM32 cross-target Clippy passes with the existing needless_return warning in binary.rs exempted; physical Android 10 ARM32 validation remains required.
Replace the Go backend with the Rust workspace and route Android/iOS through
UniFFI bindings. Include the migrated extension runtime, network, providers,
media metadata, downloads and library operations, with version 5.0.0+147.
Remove Go sources, adapters, native build selection and CI dependencies.
Build Rust unconditionally and lock the iOS Rust pod using a relative path.
Retain legacy source and migration evidence in a local ignored archive.
Validation: Android Kotlin compile and 53 native tests; Swift Rust-branch
equivalence and syntax; CocoaPods install; workflow, shell, Ruby, plist and
diff checks. Reuse the preceding 100 Rust tests, fmt/Clippy and five-ABI
build checkpoint; no new APK or iOS application build for this cleanup.
Known follow-up: URL/URLSearchParams globals are missing from the Rust JS
runtime. A controlled extension replay confirms a URL-resolution regression;
this commit does not fix that runtime gap.
zarzet