0.15.1

The owner's accounts, as the exchange lists them, so a move's side can be named. PR #40.

Added

• accounts() on ExchangeClient: the owner's accounts the key reaches, each an ExchangeClientAccount with the exchange's own id (the text a ledger side's account carries and an account parameter takes) and the name the exchange gives it, nil where it gives none. The default implementation throws notOffered(member: "accounts"), so an existing conformer still compiles. A consumer names a subAccountTransfer's other side by matching the side's account to an id here; the names were resolved privately before.
• Hyperliquid: the main wallet the key is the agent of (userRole), by its address with no name, then each sub-account of subAccounts, by its address (lower-cased) with its name, in Hyperliquid's order.
• Coinbase: List Portfolios, each portfolio by its uuid with its name, in Coinbase's order; the documentation states the call "retrieves all portfolios of a user", a deleted one included as listed. The key's own account reads still answer for its portfolio alone.
• Kraken: notOffered; subaccounts are institutional-only ("currently only available to institutional clients") with no listing endpoint.