Make English the repository working language (#5)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/web/e2e/subagent.spec.mjs

@@ -3,7 +3,7 @@
  * session_meta pointer for the child session; the server's readMessages expands the child Trace
  * from that pointer and fills in the origin chain, and the frontend reattaches the child session
  * to the tool card from that. Also verifies the child session's title is generated by the model
- * from **the child session's own conversation** (the mock only replies with "child agent TODO
+ * from **the child session's own conversation** (the mock only replies with "Subagent TODO
  * summary" when the title request sees the child's own answer), and that discovery-based
  * backfill must not collapse it to NULL.
  *
@@ -60,13 +60,13 @@ test("subagent card survives a reload; child session title is generated from its
   await page.goto(`${BASE}/chat/${sessionId}`);
   const ta = page.getByPlaceholder(/输入消息/);
   await ta.waitFor();
-  await ta.fill("跑子agent");
+  await ta.fill("run a subagent");
   await page.getByRole("button", { name: "发送" }).click();
 
   // Parent's final answer (turn 2): the whole turn has ended. Nothing changes with streaming
   // after this, so assertions are deterministic (turn end collapses the "Reasoning & tools"
   // group, and child session end collapses the child session card).
-  await expect(page.getByText("命令已执行完成，结果符合预期。")).toBeVisible();
+  await expect(page.getByText("Command finished; the result looks as expected.")).toBeVisible();
 
   /** Expand the "Reasoning & tools" group → expand the child session card → child session body visible. */
   const openSubagent = async () => {
@@ -78,7 +78,7 @@ test("subagent card survives a reload; child session title is generated from its
     const card = page.getByRole("button", { name: /子会话/ }).first();
     await expect(card).toBeVisible();
     await card.click();
-    await expect(page.getByText("子 agent 报告：3 处 TODO").first()).toBeVisible();
+    await expect(page.getByText("Subagent report: 3 TODOs").first()).toBeVisible();
   };
 
   // Under live streaming, the child session card is nested inside the run_subagent tool card.
@@ -95,5 +95,5 @@ test("subagent card survives a reload; child session title is generated from its
     ).json();
     return list.sessions.find((s) => s.sessionId !== sessionId)?.title ?? null;
   };
-  await expect.poll(childTitle, { timeout: 10000 }).toBe("子 agent 的 TODO 统计");
+  await expect.poll(childTitle, { timeout: 10000 }).toBe("Subagent TODO summary");
 });