fix: add Workbench projection read model

web/hwlab-cloud-web/scripts/workbench-server-state.test.ts

@@ -1,9 +1,12 @@
+// SPEC: PJ2026-010401 Web工作台 draft-2026-06-18-r1; PJ2026-0104010803 唯一投影 draft-2026-06-18-p0-unique-projection; PJ2026-010403 API契约 draft-2026-06-18-r1.
+// Responsibility: Regression tests for Workbench route parsing, server-state projection, and session tab status authority.
+
 import assert from "node:assert/strict";
 import test from "node:test";
 
 import type { WorkbenchSessionRecord } from "../src/types/index.ts";
 import { initialWorkbenchSessionIdFromLocation } from "../src/stores/workbench-projection.ts";
-import { createWorkbenchServerState, reduceWorkbenchServerState, selectActiveMessages, selectActiveSession, selectTraceAuthorityById } from "../src/stores/workbench-server-state.ts";
+import { createWorkbenchServerState, reduceWorkbenchServerState, selectActiveMessages, selectActiveSession, selectSessionStatusAuthority, selectTraceAuthorityById } from "../src/stores/workbench-server-state.ts";
 import { sessionToSessionTab, stableSessionList } from "../src/stores/workbench-session.ts";
 
 test("Workbench route parsing accepts only session routes", () => {
@@ -75,3 +78,25 @@ test("Workbench session tab status is read from server projection", () => {
   assert.equal(tab.status, "running");
   assert.equal(tab.running, true);
 });
+
+test("Workbench server-state session detail updates session status authority", () => {
+  let state = createWorkbenchServerState();
+  state = reduceWorkbenchServerState(state, {
+    type: "session.status",
+    session: { sessionId: "ses_backfill", status: "running" }
+  });
+  state = reduceWorkbenchServerState(state, {
+    type: "session.detail",
+    session: {
+      sessionId: "ses_backfill",
+      threadId: "thr_backfill",
+      status: "completed",
+      lastTraceId: "trc_backfill",
+      updatedAt: "2026-06-18T00:00:03.000Z"
+    }
+  });
+
+  const authority = selectSessionStatusAuthority(state).ses_backfill;
+  assert.equal(authority?.status, "completed");
+  assert.equal(authority?.lastTraceId, "trc_backfill");
+});