v0.1.1 -- darwin build fix

Patch release. Same code as v0.1.0 plus one rust-toolchain.toml line
(`targets = ["aarch64-apple-darwin"]`) so the nomograph rust-cli CI
image's prepared darwin target reaches the pinned 1.94.0 toolchain.
The v0.1.0 tag pipeline failed `build:darwin-arm64` for this reason;
v0.1.0 still landed on crates.io but had no GitLab Release artifacts.

This release ships both linux-amd64 and darwin-arm64 binaries plus
SBOMs and cosign signatures via the GitLab package registry.

`cargo install patinate` picks up v0.1.1 automatically. Existing
v0.1.0 installs are functionally identical.

See README.md for install + quickstart, CHANGELOG.md for the full
v0.1 feature surface, CONTRIBUTING.md for the dev loop.