chore: list all seven verified pool transactions, payments included

Two of the seven are Withdrawal events: private payments this checkout
made on mainnet. Earlier I looked for an event named Withdraw and
reported none existed; the pool emits Withdrawal, so those payments were
there all along. The README now carries the full ledger, which balances
to the STRK left shielded.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>