The engine to bridge.
Caller tuning; only name is supported today.
A disposer that decrements the per-graph refcount and runs the actual cleanup on the last release. Idempotent — calling the disposer twice is a no-op (#238).
When __REDUX_DEVTOOLS_EXTENSION__ is undefined this returns an
inert shared no-op without allocating the connection, the handler
table, or the bridge state. The zero-cost gate test asserts no
observable side-effects in that path.
Under React StrictMode the host calls connectDevtools(g) twice
in the same effect cycle (mount → cleanup → mount) and may also
have two live mounts overlapping for the same graph instance.
Both cases share a single underlying panel connection via
ACTIVE (#238).
Wire a Graph to the Redux DevTools Extension and return a disposer.