RFC: li-chem — DFT, ab initio, TDDFT, AI-QM (PH-QM)¶

Status: Draft
Track: PH-QM
Vision: world-studio-vision.md

Problem¶

Gameplay physics.chem ≠ quantum chemistry. Users need easy, fast, provable QM APIs in Li.

Proposal¶

New package li-chem (import chem.dft, chem.tddft, chem.ml).

def run_dft(geometry: Geometry, basis: str, method: str) -> DftResult
  requires geometry_valid(geometry)
=
  ...

Li syntax¶

Use def for all new APIs. Do not document bare proc. extern proc only for FFI. Every exported def (and each extern proc) needs requires / ensures / decreases. The parser still accepts legacy bare proc in old trees only — reject that syntax in new Studio/game-dev docs and package code.

chem.ml: surrogates, delta-learning (PH-ML async); filters proved in Li.

Compliance¶

CRITICAL tier — SBOM, traceability PKG-li-chem.

Note¶

Do not overload li-physics-chem (reaction networks for games).