ContextEventRow

Record something the agent pulled into its context: a file it read, a directory it listed, a memory file, an MCP resource, a skill, or diagnostics. The row shows an icon per kind, a verb (Read, Listed, Loaded memory, Attached, Loaded skill, Found diagnostics in) and the label with an optional detail. With items the row expands to show them, closed unless defaultExpanded. Override verbs per kind with labels. MessageList renders it automatically for a { type: "context-event", kind, label, detail?, items? } part, so in a chat you only emit the part. The row is one line and truncates its detail, so it works at any width.