v0.12.0: rename to ebmkit, simplify docs, add Claude PR review

[davidkhjo]

Coordinated batch (one PR, 7 commits) preparing the library for its PyPI debut under a cleaner name.

Changes

• Rename the distribution ebm-pytorch → ebmkit (pip install ebmkit). The import stays import ebm (distribution name ≠ import name, like scikit-learn/sklearn), so no code, tests, or examples change. Repo already renamed to ebmkit; cache dir → ~/.cache/ebmkit; viz install hint, CITATION, CONTRIBUTING, CLAUDE.md, LICENSE, and all project URLs updated.
• Docs simplified: removed the mkdocs / GitHub Pages site (mkdocs.yml, docs.yml, docs/api/, docs/index.md, the [docs] extra, the Documentation URL). Converted the surviving guides to plain GitHub markdown (admonitions → blockquotes, LaTeX \(...\) → GitHub $...$). Rewrote the README as a clean, conventional front door with badges and absolute links (so the PyPI page renders correctly).
• Claude PR review: added .github/workflows/claude-code-review.yml (subscription auth via CLAUDE_CODE_OAUTH_TOKEN). It's gated on a repo variable ENABLE_CLAUDE_REVIEW so it stays inert until auth is configured.
• Version → 0.12.0; CHANGELOG updated.

Verification

ruff, mypy (24 files), and pytest (103) all green. uv build produces ebmkit-0.12.0 and twine check passes. checkpoint_resume.py runs end-to-end (import ebm + ~/.cache/ebmkit).

Follow-ups (David's steps): PyPI trusted publisher under project/repo ebmkit; Claude review auth (install app + CLAUDE_CODE_OAUTH_TOKEN secret + ENABLE_CLAUDE_REVIEW=true).

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