v0.3.1

What's Changed

• Full-diagram verification of every curriculum lesson (exact node/edge sets) + 3 accuracy fixes by @rcronk in #56
• Audit and expand git tutorial curriculum to 39 episodes by @rcronk in #59
• Release: full-diagram lesson verification, git-data oracle, bare-repo support, 5 new lessons by @rcronk in #57
• Automate release versioning, changelog, and a breaking-change gate by @rcronk in #61
• Release: automated versioning, breaking-change gate, PyPI changelog by @rcronk in #62

Full Changelog: v0.3.0...v0.3.1