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/agent-panel-resize.e2e.ts

@@ -43,7 +43,7 @@ test("dragging the Agent edge keeps the workspace attached and preserves the dra
   const panel = page.getByRole("complementary", { name: "Agent 命令面板" });
   const workspace = page.locator("#main-workspace");
   const handle = page.getByRole("separator", { name: "调整 Agent 面板宽度" });
-  const prompt = panel.getByPlaceholder("输入调度问题，Agent 将通过后端会话流式响应");
+  const prompt = panel.getByPlaceholder("询问供水问题，或描述需要处理的任务");
   await expect(panel.getByText("当前上下文", { exact: true })).toHaveCount(0);
   await prompt.fill("保留尚未发送的诊断问题");
   await expect(panel).toHaveCSS("width", "500px");
@@ -231,7 +231,7 @@ test("the floating condition feed coordinates with the docked Agent", async ({ p
     .poll(async () => Math.round((await workspace.boundingBox())?.x ?? 0))
     .toBeGreaterThan(400);
   const expandedOffset = Math.round((await workspace.boundingBox())?.x ?? 0);
-  const prompt = page.getByPlaceholder("输入调度问题，Agent 将通过后端会话流式响应");
+  const prompt = page.getByPlaceholder("询问供水问题，或描述需要处理的任务");
   await prompt.fill("保留尚未发送的诊断问题");
   const conditionToggle = page
     .locator("header.acrylic-navigation")
@@ -286,10 +286,33 @@ test.describe("mobile touch layout", () => {
 test("mobile alert summary opens the Agent conversation panel", async ({ page }) => {
   await page.clock.setFixedTime(new Date("2026-07-21T10:40:00+08:00"));
   await page.setViewportSize({ width: 375, height: 812 });
+  await mockWorkbenchContext(page, {
+    availability: "ready",
+    source: "none",
+    scenario_availability: "not_configured",
+    artifact_availability: "not_configured",
+    schedule_availability: "not_configured",
+    work_order_availability: "not_configured",
+    alert_availability: "ready",
+    generated_at: "2026-07-21T02:40:00Z",
+    conditions: [],
+    alerts: [{
+      id: "test-alert",
+      condition_id: null,
+      source: { task_type: "other_task", task_id: "test-task", run_id: "test-run" },
+      title: "供水压力告警",
+      description: "待核对压力异常。",
+      occurred_at: "2026-07-21T02:30:00Z",
+      severity: "warning"
+    }],
+    scenarios: [],
+    latest_analysis: null,
+    work_orders: []
+  });
   await page.goto("/", { waitUntil: "domcontentloaded" });
 
-  await page.getByRole("button", { name: /查看异常处置面板/ }).click();
-  await expect(page.getByText("来源：工况演示回退", { exact: true })).toBeVisible();
+  await page.getByRole("button", { name: "查看待办与告警，当前 1 条待处理事项" }).click();
+  await expect(page.getByText("业务告警来源：后端运行态", { exact: true })).toBeVisible();
   await page.getByRole("button", { name: "工况汇总" }).click();
 
   await expect(