The local-dictionary callback is now a C adapter around Rust-owned assignment
policy. Add a small allocator probe and focused tests for by-reference loading,
by-copy data publication, static-CCtx rejection, and allocation failure. The
probe observes the output slots during allocation so the test also protects
the original allocation-before-publication ordering. Strengthen the C and Rust
repr(C) checks with an explicit custom-allocator function-pointer size check.
The capped C-integrated build and original test suite remain deferred to the
main worker, which must run them serially under the repository's 40 GiB virtual
memory limit.
Test Plan:
- `git diff --cached --check` -- passed.
- `rustfmt --check rust/src/zstd_compress_dictionary.rs` -- passed.
- Capped cargo, make, native, fuzzer, and full-suite verification -- not run
by design; deferred to the main worker.
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