v1.7

Add pip distribution via platform-specific wheels (#66)

Wraps the existing static dsas binaries in per-platform wheels (embedded
binary + thin launcher that execs it), retagged with `wheel tags` for
manylinux/macosx/win, and published to PyPI via trusted publishing on tag
push. `pip install opendsas` now works alongside the existing curl/brew
install paths.

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>