v0.2.0 Overview

v0.2.0 corrects the direction of Agent UI around runtime events, session snapshots, artifacts, evidence, and controlled user actions.

Highlights

Reframes Agent UI as a runtime projection and surface contract standard.
Adds surface standards for Composer, Message Parts, Runtime Status, Tool UI, Task Capsule, Human-in-the-loop, Artifact/Canvas, Timeline/Evidence, and Session/Tabs.
Adds runtime event projection rules that map typed runtime events into UI surfaces without parsing prose.
Adds backend coordination guidance for summary, window detail, timeline pages, artifact preview, evidence jobs, and diagnostics.
Adds performance metrics for first status, first text paint, stream backlog, history restore, and resource pressure.
Adds session hydration, queue/steer, and acceptance scenarios for real workbench behavior.
Adds research-source notes covering AI SDK UI, assistant-ui, CopilotKit, OpenAI Apps SDK, and ChatKit.

v0.1.0 wording is superseded by this runtime-first standard.
New implementations should start from event projection, surface contracts, controlled writes, and progressive hydration.