Publish claim-by-claim spectral transfer reproduction

Add exact Theorem 3 DER-rate audit

Reproduce Thm 1/4/5: weak-to-strong distillation (student 0.025 < teacher 0.155), exact risk decomposition, PGR=0.87 recovery with optimal filter growing in N

Update logbook: Repro - What Makes a Strong Model? A Unified Spectral Analysis of Knowledge Transfer (ykWN4LG9vE)

Update logbook: Repro - What Makes a Strong Model? A Unified Spectral Analysis of Knowledge Transfer (ykWN4LG9vE)