add CLAUDE.md architecture docs and include tests in validate script

fix type-check for test files (bun:test types + ES2020 BigInt support)

add unit tests for all dataset version parsers and CI workflow

chore: restore @types /three dependency in devDependencies

Merge branch 'main' into feat/speedup_visulization

feat: add comprehensive TypeScript types and type checking

Make episode visualizer nicer (colors, formatting) add detection for still epsiodes and fix urdf visualizer

Add stats, 3d viewer, begin/end image visualization

Update next version

Added files from Mishig PR