docs(model-card): point main to cycle 4 (v3-py-hexad-spont-motiv-d768x12L-cycle2-2026-05-17)

docs(model-card): point main to cycle 3 (v2-py-hexad-spont-d768x12L-cycle1-2026-05-17)

V5.8 × 4-mode capability eval (cycle 2, 2026-05-17) — model card update

feat(model-card): cross-link dataset dancinlab/hexad-corpus v1-byte-consciousness-d128-cycle1-2026-05-17

initial commit