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Previously, the crate unconditionally depended on `std`. With this commit, the crate is marked `#![no_std]` and uses `alloc` instead of `std` for its core functionality. An opt-in `std` feature gates the `io::Write`-based APIs (`Patch::to_bytes`, `PatchFormatter::write_*_into`) and the `std::error::Error` impls on error types. `HashMap` usage is now sourced from `hashbrown` rather than `std::collections` so line classification works without `std`. Tests now require `--all-features` to run since they exercise the `std`-gated APIs and rely on `alloc` prelude imports.
Enable the `std_instead_of_core`, `std_instead_of_alloc`, and `alloc_instead_of_core` clippy restriction lints so accidental reliance on `std::` in `no_std` code paths is caught at lint time.
Previously, nothing in CI proved the crate actually works in `no_std` environments — a desktop `cargo build` with `std` omitted from features still resolves `std` through the target's sysroot. With this commit, add a dedicated job that builds against `aarch64-unknown-none`, a bare-metal target without any `std` crate, so any accidental `std` reliance fails to link. The job builds both the default configuration and `--features color` to cover the feature matrix that is expected to work without `std`.
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