Writes a single blob to Walrus. The signer needs both SUI (gas for the
register/certify transactions) and WAL (storage + write fees) — a real,
separate cost from Sui gas that this wraps but does not fund. See
/routing for the equivalent disclosure on DeepBook's DEEP fee; this is
the same category of real-infrastructure cost, not a code gap.
Writes a single blob to Walrus. The signer needs both SUI (gas for the register/certify transactions) and WAL (storage + write fees) — a real, separate cost from Sui gas that this wraps but does not fund. See /routing for the equivalent disclosure on DeepBook's DEEP fee; this is the same category of real-infrastructure cost, not a code gap.