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## Why `main` fails dev-profile Cargo and Bazel Clippy builds because `core/src/tools/runtimes/mod_tests.rs` imports `PathExt` after its last use was removed. With warnings denied, that stale import prevents `codex-core` test targets from compiling across platforms. ## What changed Remove the unused `PathExt` import. Remaining `.abs()` calls in the module operate on `PathBuf` and continue to use `PathBufExt`. ## Validation - `just fmt` - Focused `codex-core` test compile attempted; blocked locally by disk exhaustion before compilation completed. The CI failure itself is the unused-import diagnostic this change removes.