Apply M31 commands through the shared ledger

Apply M31 commands through the shared ledger

The assembly consumes its router queue and validates physical targets
before single or grouped output writes. Contiguous steady coils share
one write and a complete readback. Transport failures fail the batch,
while feedback mismatches fail only the affected members. Pulses avoid
transient feedback, and analog commands enforce exact voltage bounds.

The shared ledger stores outcomes before any feedback or result send.
Duplicate deliveries replay those outcomes without another physical
action, including after a publication failure or device reconnect.

Issue: 8fdc39a