daemon: Consider locator format

[rekmarks]

As of #2160, the endo locator format is:

endo://{nodeIdentifier}/?id={formulaNumber}&type={formulaType}

We are not committed to this format. Another approach would be:

endo://{formulaNumber}.{nodeIdentifier}?type={formulaType}

In this format, if we change the encoding of the domains to something denser than hexadecimal, it would have the virtue of fitting the formula number and node identifier in the host component of the URL. The formula number is probably more suitable as a domain than a query parameter, considering that formulas are—much like bar.foo and baz.foo—distinct worlds unto themselves.