94/94 regression tests pass (+ffi-07-c-import-block).
Companion C helper lives only at
`library/vendors/sx_ffi_resolve_test/`. Critically NOT in
`sx/vendors/` (the sx repo root) and NOT in the importing
example's directory — so the `vendors/...` paths in this
example are findable solely via the stdlib search branch
(`<exe>/../../library`, `<exe>/../library`, `<exe>/library`).
That branch is the one the JNI insets bridge needs to reach
`library/vendors/sx_android_jni/sx_android_jni.c` without
forcing chess (or any consumer) to vendor an identically-named
copy. The test pins the resolution end-to-end:
- #include resolves; clang parses the .h; c_import.zig
synthesizes #foreign fn decls for `sx_ffi_resolve_test_add` /
`_mul`.
- #source resolves; the .c is compiled into the build's
object list.
- sx calls the synthesized decls and prints results.