Event System: Tracking Issue #6236

Overview

This is the tracking issue for the Event System & State Management initiative — the largest architectural refactor for v1.0, touching event processing, state synchronization, and the developer-facing API.

Goals

• Redesign EventHandler with a global registry, awaitable semantics, and partial-arg call convention
• Extract dirty/accessed var tracking into a standalone mixin independent of rx.State
• Introduce ~~EventContext~~ as the foundational execution primitive (owns state lock, manages backend event queue, tracks mutability scope)
• Move the event queue to the backend, eliminating frontend round-trips for chained events
• Make ~~rx.Field~~ a first-class descriptor enabling composable arbitrary states without ~~rx.State~~ inheritance
• Add full-stack OpenTelemetry instrumentation