whyyoudodisjoel/axler

AI Summary: This issue proposes setting up CI/CD workflows to automatically execute and evaluate project benchmarks. The workflow should compare current benchmark results against the `main` branch, failing the build if a performance regression is detected. An override mechanism is required to allow maintainers to approve regressions, preventing CI failure.

AI Summary: This issue proposes a refactoring effort to replace explicit lifetime references (`&'a`) with `Box` types throughout the codebase. The primary motivation is to alleviate common compiler errors related to lifetimes, which are currently hindering development, especially for future neural network layer implementations. While this change is expected to simplify code and improve developer experience, it requires careful implementation to ensure any performance regressions are minimal.

AI Summary: This issue proposes adding support for a 'Pad' feature. The implementation should adapt an existing mechanism (similar to issue #3) to add a constant value, which must be correctly rendered as a literal for the padding operation.