Update LEARNING.md with Exp 3 PCA/SVD full results + v5.1 entry

Update LEARNING.md for v5 refactor + new entries

v4.3: Update LEARNING.md with closed-loop methodology, separated competitive intelligence from user strategy, updated version history

Upload LEARNING.md with huggingface_hub

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Add benign overfitting theory, double descent, LOOCV Ridge tuning, condition number diagnostics (2026-04-25)

Add lstsq conv research: Ridge regularization, stride_tricks, benign overfitting theory (2026-04-25)

Add deep competitive analysis from notebook dissection (2026-04-25)

Update LEARNING.md: PyTorch conv results, lstsq overfitting analysis

Add LEARNING.md - full history, mistakes log, competitive intel, technical deep-dives