License: paper text GPL-3.0-or-later, code CPSC-ESCL-1.0 or AGPL-3.0-only

Add Zenodo DOI 10.5281/zenodo.23287576

Add CPSC φ⁴ lattice compilation paper (October 2026)

Metadata: discovery tags (collection, languages)

Sync with GitHub, license metadata from LICENSE files, commercial license notice

chore: restore papers as model repo (was reserved name)