The MT serial-turn policy already ran in Rust but still crossed back into C
for the XXH64 update. Pass the live C-owned checksum state through the explicit
ABI and let Rust perform the update after the existing LDM and turn gate. C
retains the private serial state, synchronization, and raw sequence storage.
Test Plan:
- ulimit -v 41943040; CARGO_BUILD_JOBS=1 cargo check --tests (rust)
- ulimit -v 41943040; CARGO_BUILD_JOBS=1 cargo clippy --tests -- -A clippy::manual-bits -D warnings (rust)
- ulimit -v 41943040; make -j1
- ulimit -v 41943040; make -j1 -C tests test
- Added a Rust checksum-vector test; standalone cargo test remains link-blocked by existing C-owned decompression-view symbols.
ddidderr
b72c51216b