Merge improvements from neurips2026anonymous (sans anonymization)

[johmathe]

Summary

Brings the experiments restructure, README enrichment, and submission cleanup over from neurips2026anonymous. Skips all anonymization (real authors / URLs / LICENSE / release infra preserved on main).

What's included

• Restructure paper/experiments/ → top-level experiments/
• Code edits to experiment scripts (organ3d, pcam, spherical_mnist, spherical_mnist_reconstruction)
• README: Supported Groups, API, and Benchmarks sections
• Delete submission cruft: docs/, DESIGN.md, benchmarks/figures/, benchmarks/inversion_results/, benchmarks/paper_benchmarks.{tex,pdf}, .cursorrules, paper/ working files
• Exclude experiments/ from pre-commit hooks (research scripts, not library code)

What's preserved on main (NOT taken from anon)

• LICENSE (anon had none)
• RELEASE.md (anon had none)
• .github/workflows/publish.yml (anon had none)
• pyproject.toml: real authors, GitHub URLs, version 0.3.5, optional-dependencies.experiments block
• .github/workflows/tests.yml: codecov slug geometric-intelligence/bispectrum
• README.md: CI badges (Tests, Pre-commit, codecov) and git clone URL in Development section

Verification

• rg -i "anonymous|4open\.science" → no matches
• pytest tests/ → 584 passed, 1 pre-existing failure in test_so3_on_s2.py::TestSparseParity (also fails on stock main, not introduced here)

Test plan

• CI tests pass on this branch
• Spot-check experiments/{organ3d,pcam,spherical_mnist}/{model,train,data}.py diffs are real code improvements, not just anonymization
• Confirm no DESIGN.md references leak into source after deletion

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