SOL deposit/withdraw vault with PDA seeds, bump, checked math, events, and close instruction.
A production-ready vault program. Initialize a PDA vault, deposit SOL, withdraw with checked arithmetic, emit events, and close. Exercises: PDA seeds + bump, transfer-sol, math (checked add/sub), require, if-else, emit-event, close constraint, constants. Generates valid Anchor, Pinocchio, and Quasar code.
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