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.

tests/browser/investigation-diagram-styles.e2e.ts

@@ -3,7 +3,7 @@ import { writeFile } from "node:fs/promises";
 import { mockAgentApi } from "./support/mock-agent-api";
 
 test("调查图样式对照保留中文标题、分工和真实 SVG 关系", async ({ page }, testInfo) => {
-  await page.route("**/api/v1/**", (route) => route.fulfill({ json: { items: [] } }));
+  await page.route("http://127.0.0.1:8787/api/v1/**", (route) => route.fulfill({ json: { items: [] } }));
   await mockAgentApi(page);
   await page.goto("/", { waitUntil: "domcontentloaded" });
   await page.setViewportSize({ width: 1536, height: 1250 });