Prepare v0.1.0 GitHub release

[rsasaki0109]

Goal

Cut the first public release once the current educational surface is stable and CI is green.

Tasks

• Confirm main passes CI on Python 3.10, 3.11, and 3.12.
• Run python3 scripts/run_all_smoke_tests.py --check-gifs locally.
• Write release notes around the core promise: 36 runnable examples, 35 GIFs, 101 tests, minimal core dependencies.
• Tag v0.1.0 and create a GitHub release.
• Link the release from docs/public_launch.md after it exists.

Acceptance Criteria

• A v0.1.0 GitHub release exists.
• Release notes include first-run commands and the strongest GIF examples.
• README install guidance still works from a clean checkout.