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Make NB4 fit 90 minute CPU submission limit

Optimize NB4 inference to avoid Kaggle timeout

Make NB4 ready for B0 5-fold submission with safe no-TTA default

Set NB2 safe default initial run and keep Kaggle-safe training

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Add NB2 safe run patch notes for Kaggle kernel death

Fix NB2 Kaggle RAM crash by disabling soundscape cache and workers

Fix NB3 NB1 filenames and time parsing

Fix NB2 runtime, label expansion, and NB1 filename mismatch

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Update ML Intern artifact metadata

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initial commit