The v0.1.0 workflow failed because:

1. **Linux x86_64 was cancelled (not failed)** — matrix default fail-fast
   cancelled x86_64 when aarch64 failed.
2. **Linux aarch64** — `ring` crate ARM asm cross-compile error
   (`"ARM assembler must define __ARM_ARCH"`).
3. **Windows** — `hdf5-metno-src` CMake build fails inside the
   maturin-action Windows runner.

macOS x86_64 and arm64 both passed.

Fixes:
- Add `fail-fast: false` so independent matrix jobs don't cancel each
  other.
- Temporarily drop Linux aarch64 and Windows from the matrix (TODO
  comments + GitHub issues to re-enable once the toolchain issues are
  resolved upstream).
- Now building: Linux x86_64 · macOS x86_64 · macOS arm64 · sdist.
  That covers ~95% of Python users on 2024+ hardware.