Call the authoritative DDict constructor directly from the Rust decompression
policy after converting the shared repr(C) allocator projection. Remove the
C forwarding declaration and wrapper so dictionary creation no longer crosses
an unnecessary Rust-to-C-to-C boundary, while compile-time size and alignment
checks keep the allocator conversion tied to the ABI contract.
Test Plan:
- `ulimit -v 41943040; cargo +nightly fmt --manifest-path rust/Cargo.toml --all -- --check`
- `ulimit -v 41943040; CARGO_BUILD_JOBS=1 cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings`
- `ulimit -v 41943040; make -j1`
- `ulimit -v 41943040; make -j1 -C tests test`
- `ulimit -v 41943040; CARGO_BUILD_JOBS=1 cargo clippy --manifest-path rust/cli/Cargo.toml --all-targets -- -D warnings`
- `ulimit -v 41943040; CARGO_BUILD_JOBS=1 cargo test --manifest-path rust/cli/Cargo.toml --all-targets`
The integrated checks ran at the combined working-tree tip, including the
parallel MT checksum seam that remains as the next commit. Standalone root
Rust unit linking remains unavailable because the crate imports C-owned bridge
symbols without a Cargo build/link setup.