docs: 优化审查提示词，禁止 subagent 读取文件，明确 apply 阶段不动主规范

config.yaml: subagent 限定为计算密集/多步骤任务，文件读取用 Read 工具
prompt-proposal-review.md: 收集阶段加入读取约束和分步策略，复核补全待澄清清单
prompt-apply-review.md: 禁止同步主规范，新增 Spec 覆盖完整性扫描与补充流程

tests/server/helpers.test.ts

@@ -143,8 +143,14 @@ describe("mapCheckResult", () => {
   });
 
   test("损坏 observation JSON 返回 null observation", () => {
-    const result = mapCheckResult(makeRow({ observation: "{invalid json" }), "http");
-    expect(result.detail).toBeNull();
-    expect(result.observation).toBeNull();
+    const originalWarn = console.warn;
+    console.warn = () => undefined;
+    try {
+      const result = mapCheckResult(makeRow({ observation: "{invalid json" }), "http");
+      expect(result.detail).toBeNull();
+      expect(result.observation).toBeNull();
+    } finally {
+      console.warn = originalWarn;
+    }
   });
 });