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refactor: modernize production module layout to use Rust 2018 style - #165
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Migrate the production source code hierarchy away from the legacy `mod.rs` pattern to the idiomatic `foo.rs` and matching `foo/` directory style. This aligns the codebase with modern Rust standards, improves explicit module discoverability, and resolves editor tab name clutter. Deliberately retained the traditional `tests/helpers/mod.rs` structure for shared integration test utilities. Because Cargo treats every root-level file inside the `tests/` directory as an independent crate root, applying the new module layout style here causes Cargo to misinterpret helper code as standalone test suites. Using a nested `mod.rs` file inside a sub-directory allows the compiler to use its native module resolution loops perfectly without breaking standard tooling like `cargo fmt` and `cargo clippy`.
justinpettit
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Migrate the production source code hierarchy away from the legacy mod.rs pattern to the idiomatic foo.rs and matching foo/ directory style. This aligns the codebase with modern Rust standards, improves explicit module discoverability, and resolves editor tab name clutter.
Deliberately retained the traditional tests/helpers/mod.rs structure for shared integration test utilities. Because Cargo treats every root-level file inside the tests/ directory as an independent crate root, applying the new module layout style here causes Cargo to misinterpret helper code as standalone test suites. Using a nested mod.rs file inside a sub-directory allows the compiler to use its native module resolution loops perfectly without breaking standard tooling like cargo fmt and cargo clippy.