The window preparation callbacks already delegated dictionary-distance policy to
Rust, but C still copied projected limits and cleared loaded-dictionary and
match-state pointers. Add a checked pointer projection so Rust applies both
window-limit and dictionary-validity side effects; C retains private window
layout, pointer-index arithmetic, assertions, and diagnostics.
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
ddidderr
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