Interface LatchConfig<A, S>

The confirm gate a write here must pass — see ConsoleResource.confirm. A record names the field transition it holds (mode → 'sip'); the registry decides, the station never sees confirm.

Cross-field coupling applied once per accepted patch, after decode+clamp of every field.

What a fresh instance of this row IS — published row-wide so a client never compiles a declared starting value into its own bundle.

The SAME factory the store makes a new item with, handed to the contract door rather than restated: makeFbsChannelState() is the arming a channel has before anyone arms it, and a panel that needs the notch Q to reset to must read it from the desk or invent one.

Declared only where the starting point is genuinely row-wide. A row whose fresh state depends on the device behind the instance omits it, exactly as a per-instance travel is withheld from travels() — a plausible wrong default is the defect this door closes, not one it may introduce.

The item-lifecycle doors. A scalar row is removable when its ONE store can genuinely lose the item — a send DELETE frees the engine's slot, which is a different fact from a level-0 write even though both end with no send in the ledger.

What a committed write here means for the session's dirtiness and the operator's history. Absent means the layer default: it dirties the session, is not undoable, and is not a barrier (see ResourcePolicy).

Drives the audio from the post-write state; absent = state-only entity.