test(node): a real signed audio_root save through the full challenge path

Every existing audio_root test either called ops.set_audio_root directly
or mocked out _issue_admin_challenge — none of them exercised real
signature verification, _do_admin_response, or the shared groups_ctx/
roster wiring _run_op depends on. Worth ruling out a break somewhere in
that real path specifically: a report described a save that looked like
it worked (the Music tab showed content right after) not surviving a
reload.

Drives the real _do_audio_root -> admin_challenge -> sign -> _do_admin_response
-> _admin_exec_audio_root path with a genuine Ed25519 operator key, then
opens a *separate* Roster instance against the same db file — the direct
question a "worked, then reverted" report raises: does the value actually
land durably, in a form any later connection reads back correctly. It
does; this passes. The one thing missing from the session fixture to get
this far was peer-registry self-registration (a real session adds itself
on handshake completion — without it, the final ack has nowhere to go,
including back to the requester).

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