🪢 Molecular-orbital / bonding viewer

A Knit is two atomic orbitals combining. In phase (bonding) piles electron density between the nuclei — that shared density is the bond. Out of phase (antibonding) leaves a node between them. Two hydrogen-like centres, |ψ|² rendered on a canvas — molgang-native, no dependencies. See the single-atom orbital viewer for the building blocks.

Bonding = ψ_A + ψ_B, antibonding = ψ_A − ψ_B, over two hydrogen-like centres on the bond axis (atomic units, unnormalised, density scaled). A teaching visualisation of orbital overlap — the quantitative electronic-structure path (RDKit/PySCF, then Qiskit Nature) is on the #214 roadmap.