activate

StrictMode-safe lifecycle hook for framework bindings.

React 18+ StrictMode intentionally mounts → unmounts → remounts components in dev to surface effect-cleanup bugs. A naive useEffect(() => () => controller.dispose()) would permanently tear the controller down on that first synthetic unmount, leaving every subsequent submit() a silent no-op.

Call activate from the bind site's effect and return the result as the effect's cleanup. The controller uses deferred disposal: a release() only schedules a dispose on the next microtask, which is cancelled if another activate() arrives before it fires (the normal StrictMode remount path).