ai-sherpa/perturbation-unconstrained-linear-bandits-repro

Rework: fill anchored C4 (Thm 4.2 high-prob bound) + C6 (Conj 5.3 minimax rate) -> 12/12; banked claims byte-identical

Update logbook: Repro - A Perturbation Approach to Unconstrained Linear Bandits (PABLO)

initial commit