feat(mt): move compression job creation policy into Rust
Move the multithreaded compression job-creation decision tree into a Rust
projection while keeping C-owned job descriptors, input buffers, pools,
synchronization, worker callbacks, and terminal empty-block serialization
behind explicit callbacks. The Rust policy now preserves ring-table full
checks, prepared-job retry state, prefix advancement, frame checksum rules,
and the non-first empty terminal job path without crossing private C layouts.
Test Plan:
- cargo test --manifest-path rust/Cargo.toml --all-targets -- --test-threads=1
- cargo test --manifest-path rust/Cargo.toml --no-default-features --features compression,decompression,dict-builder,legacy-v01,legacy-v02,legacy-v03,legacy-v04,legacy-v05,legacy-v06,legacy-v07 --all-targets -- --test-threads=1
- cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings
- make -B -C lib -j2 lib
- make -B -C tests -j2 test-zstd test-pool test-legacy test-invalidDictionaries
ddidderr
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