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1d9e3dcb49
Add an admin authority to the AMM config so configuration can be changed after initialization. AmmConfig gains an `authority` field, set by Initialize, and a new UpdateConfig instruction lets that admin change config values. UpdateConfig is access-controlled: the authority account must equal the stored config.authority and be passed authorized (signed). Both fields are optional — token_program_id updates the chained-call token program, and new_authority transfers admin control to a different account. Without this gate any caller could repoint the AMM at a malicious token program.