seq-mean: purge orphan pages/claim-2-second-order-optimal-stopping

seq-mean: purge orphan pages/claim-1-stopping-time-clt

seq-mean: upload rebuilt claim pages

v2: paper-scale 5000 paths, both claims VERIFIED (exact disclosure)

Update logbook: Reproduction: Beyond First-order Asymptotics in Sequential Mean Testing

Update logbook: Repro: Beyond First-order Asymptotics in Sequential Mean Testing