initiate-batch-send, transfer helpers, and claim-rent

[cavemanloverboy]

Adds two commands: initiate-batch-transfer and claim-rent.

1. initiate-batch-transfer: batches multiple SOL and SPL moves from the vault into one vault-transaction proposal. Pass each leg with --transfer: sol:<recipient>:<lamports> for SOL, or <mint>:<recipient>:<raw_amount> for SPL. It follows the same confirmation and signing flow as initiate-transfer, with optional --approve when the proposer can vote.

2. claim-rent: Scans the last N multisig transaction indices for executed/terminal proposals whose vault, config, or batch accounts can be closed, then sends batched close instructions so rent returns to the multisig rent collector; use --dry-run to list estimates without sending.

[vercel]

@cavemanloverboy is attempting to deploy a commit to the squads Team on Vercel.

A member of the Team first needs to authorize it.

[cavemanloverboy]

without these changes there is no way to transfer the native sol in a multisig via the cli. initiate-transfer only does SPL tokens

[bguillaumat-squads]

ACK