feat(workbench): integrate operational workflows and map state

src/features/agent/index.ts

@@ -1,4 +1,6 @@
 export { AgentCollapsedRail } from "./components/agent-collapsed-rail";
+export { readExecutionReport, updateExecutionReportProgress, appendExecutionReportText, type AgentExecutionReport } from "./execution-report";
+export { parseExecutionPlan, readExecutionPlanHistory, executionPlanStages, executionStatusLabels, type AgentExecutionPlan } from "./execution-plan";
 export { AgentCommandPanel } from "./components/agent-command-panel";
 export { countPendingAgentInputs, hasPendingAgentInput } from "./message-state";
 export type {
@@ -11,6 +13,7 @@ export type {
   AgentApiClient,
   AgentApiClientOptions,
   AgentChatSessionSummary,
+  AgentSessionPurpose,
   AgentEventTriggerContext,
   AgentLoadedChatSession,
   AgentSessionStreamEvent