Add model card: what this is, and which variants are valid

consolidate: absorb ties__aligned

consolidate: absorb ties__naive

consolidate: absorb task_arithmetic__aligned

consolidate: absorb task_arithmetic__naive

consolidate: absorb average__aligned

consolidate: drop the duplicated root copy

consolidate: move average__naive payload into its subfolder

merged checkpoint ({'pair_id': 'beetle-arch-pico-beetle-arch-moe', 'parent_a': 'Beetle-FineWeb-2B/beetle-bilingual-l2-50-sequential-33-67-b3-fineweb-2b-nld-eng', 'parent_b': 'Beetle-nld-eng-Variants/beetle-bilingual-l2-50-sequential-33-67-b3-fineweb-2b-nld-eng-arch-moe', 'ceiling': '(floor-relative)', 'operator': 'average', 'alignment': 'naive', 'align_method': 'permutation', 'regime': 'different_corpora', 'eval_langs': 'eng+nld', 'nll_merge': 7.5951, 'nll_floor': 5.849, 'param_coverage': 0.4887, 'MS': None})

initial commit