feat(sub-account-anonymizer): until_undeployed flag on get_sub_accounts (#921)

Add a trailing `until_undeployed: bool` to the anonymizer's `get_sub_accounts` view. When true, the
view stops at the first undeployed nonce and returns only the contiguous deployed prefix; when
false it resolves every nonce in [start, end) (unchanged). This lets the client resolve a user's
deployed sub-accounts in one view call instead of scanning window-by-window client-side.

Regenerating SubAccountAnonymizerABI also picks up the OpenNote.collect_policy field, from which
the committed ABI had drifted (never regenerated after CollectPolicy landed in Cairo).

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