style: fix clippy warnings and cargo fmt formatting

- Replace redundant closure with function reference (clippy::redundant_closure)
- Use is_some_and instead of map_or(false, ...) (clippy::unnecessary_map_or)
- Run cargo fmt across all files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/project_tests.rs

@@ -239,4 +239,3 @@ fn test_import_existing_program() {
         .assert()
         .success();
 }
-