The CLI trace translation unit still contained the complete CSV writer and
strong callback implementations even though the Rust CLI archive already had
the equivalent trace module. Reduce the C file to its public-header shim and
make the Rust implementation authoritative, preserving the exact CSV header,
version assertion, timing fields, and no-trace build behavior. Focused tests
cover header creation and the version-mismatch assertion.
Test Plan:
- CLI tests: 161 default and 127 reduced-feature -- passed
- Focused trace tests: 3/3 in both configurations -- passed
- `make -B -C programs -j2` for all CLI variants -- passed
- Trace compression/decompression smoke test -- passed
- C shim compile with and without `ZSTD_NOTRACE` -- passed
- Clippy, nightly rustfmt, and `git diff --check` -- passed
Implement the CLI trace callbacks and CSV logger in Rust, preserving the ZSTD_Trace ABI, timing fields, parameter reporting, mutex-protected writes, and no-op disabled behavior. Add the module to every Rust CLI archive and exclude the duplicate C trace object from Rust-backed program targets.
Test Plan:
- cargo test --manifest-path rust/cli/Cargo.toml (92 passed)
- cargo clippy --manifest-path rust/cli/Cargo.toml --all-targets
- make -B -C programs -j2 zstd
- Rust trace smoke: programs/zstd -q --trace=/tmp/zstd-rust-trace-smoke.csv -c /tmp/levels-input
- make -B -C tests -j2 test-cli-tests (41 passed)
ddidderr