Add competition holdout loader + wire submissions to real data#1
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pnpl.competition.LibriBrainCompetitionHoldout downloads the LibriBrain 2026 holdout (pnpl/LibriBrain-Competition-2026) and enumerates the canonical submission rows: one (306, 250) window per word, for the Deep (subj0) and Broad (subj1-39) tracks, across both the sentence and isolated-word sources, every valid word. The loader is the single source of truth for row order / submission index. - holdout.py: streaming loader (iter_windows with a one-file MEG cache), track presets, and an npy-header shape read so index building never decompresses the large meg arrays. - competition/__init__.py: export the loader + track/source constants. - tests/test_competition_holdout.py: offline tests over synthetic npz fixtures (enumeration order, window extraction, batching, guards). - examples/submit_pnpl2026.ipynb: build the submission from the real holdout loader instead of range(N). - docs/competition.md (+ _toc.yml): document the format, tracks, and the canonical row ordering.
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pnpl.competition.LibriBrainCompetitionHoldout downloads the LibriBrain 2026 holdout (pnpl/LibriBrain-Competition-2026) and enumerates the canonical submission rows: one (306, 250) window per word, for the Deep (subj0) and Broad (subj1-39) tracks, across both the sentence and isolated-word sources, every valid word. The loader is the single source of truth for row order / submission index.