Fix BERNN probability and batch mapping

Prepare head sweep tuned defaults

Expose BERNN class triplet option

Seed Real leaderboard baseline examples

Pass external validation splits into BERNN fit

Expose validation labels to fit

Switch model submissions to fit API

Expose validation split API to submissions

Expose external test groups in BERNN submissions

Externalize BERNN validation splits

Use BERNN 0.6.21 release by default

Pin BERNN sklearn-style fit release

Use sklearn-style BERNN fit workflow

Keep BERNN holdout test split external

Recover BERNN hparam search pipeline on HF branch

src/bernn_tuned_defaults.json

adding more debug

Update BERNN leaderboard publication

BERNN model selection: parameterized baseline + presets + UI builder

bernn baseline: set config.dataset (bernn reads self.args.dataset for log dir; TrainingConfig lacks it)

Sync app to local version: add database/baselines/dataset_info/version_manager modules, update app.py & code_challenge (bernn n_repeats>=3 fix), expand requirements