Re-pin app FFI to 17b7593 (base red from #32436)
Base-red-job: cmux-next / cmux-next checks (god files, concurrency, crash safety, l10n)
#32436 (cmux-cloud-start-core step A) changed an app FFI input without re-pinning. Since 17b75935 (run 41478819438), "Check the app FFI pin" has been red on base. This pins the published cmux-app-ffi-17b75935 release (checksum 883643bb…95b5). #32436 changed no C header and no Swift. check-app-ffi-pin.sh --verify-release passes on this tree, and no other FFI input changed since.
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Summary by cubic
Re-pins the app FFI to 17b75935 in CmuxNext so the FFI pin check passes on base.
#32436 changed an app FFI input (cmux-cloud-start-core) without updating the pin, leaving the "Check the app FFI pin" step red. This updates CCmuxAppFFI to the published cmux-app-ffi-17b75935 release and its checksum. No C header or Swift changed in #32436, and no other FFI input changed since.