feat(agent): support Responses steering and project-aware tools

Use the dedicated TJWATER_AGENT_URL and Responses stream protocol. Keep running
turns active while users steer or queue follow-ups and edit pending delivery.
Refresh the model catalog before generation and preserve approval mode selection.

Integrate scoped investigation messaging/presentation, geographic place selection,
current Agent composer styles and supporting workbench contracts.

Validation: 77 focused Vitest checks, 21 browser cases, lint, typecheck and
production build. Preserve direct Server/Agent routing and project authentication.

src/features/agent/index.ts

@@ -3,26 +3,35 @@ export { agentTaskDiscussionContextSchema, agentTaskContextReferenceSchema, type
 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 { AgentChartView } from "./components/agent-ui-envelope-renderer";
 export { countPendingAgentInputs, hasPendingAgentInput } from "./message-state";
 export type {
   AgentCommandPanelPresentation,
+  AgentConversationProjectOption,
   AgentWorkspaceContextItem
 } from "./components/agent-command-panel";
 export { AgentPersona } from "./components/agent-persona";
 export { createAgentApiClient } from "./api/client";
+export { useAgentMessageInbox } from "./hooks/use-agent-message-inbox";
+export type { AgentMailboxMessage } from "./api/agent-messages";
 export type {
   AgentApiClient,
   AgentApiClientOptions,
+  AgentInputDelivery,
+  AgentResponseInput,
   AgentChatSessionSummary,
   AgentSessionPurpose,
   AgentEventTriggerContext,
   AgentLoadedChatSession,
-  AgentSessionStreamEvent
+  AgentSessionStreamEvent,
+  AgentRecentActivity,
+  AgentPromptSuggestion
 } from "./api/client";
 export {
   agentBootstrapKey,
   agentSessionsKey,
   fetchAgentBootstrap,
+  resolveAgentModelSelection,
   fetchAgentSessions,
   type AgentBootstrapData
 } from "./api/swr";
@@ -83,8 +92,10 @@ export type {
 } from "./types";
 export type { SafeChartData, SafeChartSeries, SafeChartSpec } from "./chart-data";
 
-export { AgentChartView } from "./components/agent-ui-envelope-renderer";
 export { parseFrontendChart } from "./frontend-action/chart";
+
 export { parseAnswerUiBlock } from "./answer-ui/contract";
 export type { AnswerUiBlock, AnswerUiPart } from "./answer-ui/contract";
 export type { AnswerUiMapTarget } from "./answer-ui/answer-ui-view";
+
+export { ResponsesChatTransport, createResponseRequest } from "./api/responses-transport";