rescore.py: resolve v5-S2 ckpts under checkpoints/v5s2/seed_*/best_phase2.pt (HF layout) with fallback to results/v5_training/10seed/... (dev layout)

add v5-S2 3-seed ensemble ckpts (seeds 1024/5555/789) — canonical Q_theta from paper (rho_bar = 0.5201 on 8 OOD)

fix rescore.py bugs: missing holo->apo Kabsch (Q_apo=0 for all designs), residue-ID alignment on renumbered chains (PXDesign/Protenix), HETATM chain-A dropped, single-seed -> 3-seed ensemble, add .cif support

Update README.md

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Update README.md

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AlloGen public release: Q_theta scorer + PXDesign guidance + Colab demo