Move the intermediate worker progress state update out of the C callback and
into a Rust-owned publication leaf. The projection keeps the private job
descriptor and pthread objects in C while preserving the lock, counter update,
diagnostic, signal, and unlock order, including size_t wrapping behavior.
Test Plan:
- git diff --cached --check
- capped cargo check --tests
- capped cargo clippy --tests -- -A clippy::manual-bits -D warnings
- capped make -j1
- capped make -j1 -C tests test
- standalone capped cargo test was attempted but its hybrid link lacks the
pre-existing ZSTD_rust_dctx_trace_view, ZSTD_rust_dctx_view, and
ZSTD_rust_block_context_init symbols
ddidderr
0b18e73d4b