Release v0.1.2

Changed

• ci.yaml: the test job runs cargo nextest run --workspace --all-features
  once instead of cargo hack nextest run --each-feature. The per-feature
  matrix rebuilt heavy dependencies for every crate/feature pair and ran the
  slow integration tests serially, roughly doubling the job while executing
  exactly the same set of tests; feature-gated tests in the consuming
  repositories are all positively gated, so --all-features is a superset.
  Per-feature compile coverage remains in the clippy job.
• mise/rust.toml: the test task makes the same change so it keeps
  mirroring CI, and no longer depends on cargo-hack.

What's Changed

• revert to nextest only for ci test task by @andrew-goldie in #41

Full Changelog: v0.1.1...v0.1.2