Essential logic fix and minor additions

[0.1.1] - 2025-10-10

Added

• Crate-level and module documentation to improve API discoverability by way of "crate doc".

Changed

• Packaging: restrict published crate contents via Cargo.toml to exclude tests, examples, benches, and other development-only files.

Fixed

• Prevent rule vectors from being cleared during aggregation/defuzzification by replacing uses of mem::take with borrowed access in defuzz.rs, rulespace.rs, and aggregate.rs.
• Update mamdani_test.rs to align with the above API changes.