Underworld3 v3.0.1

Underworld3 v3.0.1

Patch release with build reliability fixes and documentation improvements.

Bug Fixes

• Fix petsc_save_checkpoint() to use XDMF compatibility groups (fixes #80)
• Fix stale build cache: ./uw build now uses --no-cache-dir to prevent
  pip from reusing wheels compiled against the wrong PETSc
• Fix Dockerfile resilience to dependency version differences
• Fix binder launcher dispatch payload and YAML quoting

Improvements

• Auto-detect binder launcher ref from git tag in RTD documentation
• Add manual dispatch overrides for binder image builds
• Update README with binder badges for v0.99, v3.0.0, and development

Contributors

Underworld development team with AI support from Claude Code.