Module sync 

Multi-surface synchronized edit sessions: broadcast, handoff, and replay.

One resource can be open in MANY surfaces at once. The SurfaceHub owns the single CANONICAL value for every resource and is the one coordination point: a committed edit on any surface is applied to the canonical store and then BROADCAST – as a Scene plus a Scene diff – to every surface/pane viewing that resource, including the surface that issued the edit. This avoids trying to make N independent transports share events; the hub is the shared state.

Edits flow through the universal default lens: an Intent is proposed and committed through edit:default, yielding the universal {op: set-value, value: <proposed>} operation, which is applied to the canonical store and recorded in an append-only EditRow ledger carrying the issuing operator and logical tick. Two surfaces editing the same resource therefore apply in submit order (last write wins), and the ledger is replayable: replay re-applies it to a seed state and reproduces the same canonical state, proving the edit log is auditable.

Handoff (SurfaceHub::handoff) opens an already-held resource on a second surface so subsequent edits broadcast to both.

Structs

Broadcast

One re-rendered Scene pushed to a surface/pane after a canonical edit.

EditRow

One append-only ledger row: a committed edit, attributed and replayable.

SurfaceHub

The canonical multi-surface coordination point.

Functions

replay

Re-apply a ledger to a seed canonical state, yielding the final state.