diff --git a/sdk/package.json b/sdk/package.json
index f4a1568..71f6324 100644
--- a/sdk/package.json
+++ b/sdk/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ctk-sdk",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "private": true,
   "type": "module",
   "scripts": {
diff --git a/sdk/src/index.ts b/sdk/src/index.ts
index 23f72d4..63ffb68 100644
--- a/sdk/src/index.ts
+++ b/sdk/src/index.ts
@@ -1,8 +1,9 @@
 import { uuid } from "./util";
 import { mergeConfig } from "./config";
 import { Transport } from "./transport";
-import { startPageSession } from "./page";
+import { startPageSession, getPageSession } from "./page";
 import { startStayTracking } from "./stay";
+import { startBusinessTracking } from "./business";
 import { buildEnvContext, collectHighEntropyHints, pageContext } from "./context";
 import { SDK_VERSION, BUILD_ID, SCHEMA_VERSION, CONFIG_VERSION } from "./types";
 import type { CtkConfig } from "./config";
@@ -65,8 +66,17 @@ function dispatch(cmd: string, arg?: unknown) {
         ...ps.attribution(),
       });
       startStayTracking(transport, ps);
+      // 0.2.1 接线（T5）：业务事件自动监听（contact_click / form_* / product_view）。
+      // 必须在 startPageSession 之后——emit 经 getPageSession() 取归属，无会话时
+      // 守卫静默丢弃（business.test.ts 首例覆盖异常顺序）。幂等性依赖调用方守卫：
+      // init 的 !transport 条件已保证只调一次。product_view 的 init 判定读挂载时
+      // 同步的 location.pathname——置于 startStayTracking 之后无时序敏感（首帧判定）。
+      startBusinessTracking(transport);
     } else if (cmd === "track" && transport) {
-      transport.push(arg as object);
+      // track 补当前段归属（T5）：宿主字段展开在前、归属在后——归属键权威（宿主
+      // 伪造的 site_id 等被覆盖），其余宿主字段原样保留。PageSession 未启动时
+      // attribution() 为 undefined，展开为无操作——保持原样走兜底组路径。
+      transport.push({ ...(arg as object), ...getPageSession()?.attribution() });
     } else if (cmd === "flush" && transport) {
       transport.flush();
     }
diff --git a/sdk/src/types.ts b/sdk/src/types.ts
index 4b14c47..575c6ac 100644
--- a/sdk/src/types.ts
+++ b/sdk/src/types.ts
@@ -9,7 +9,7 @@ export interface Attribution {
   epoch?: null; // V1.1 预留
   grant_ref?: null; // V1.1 预留
 }
-export const SDK_VERSION = "0.2.0"; // 与 package.json 同步手维护
+export const SDK_VERSION = "0.2.1"; // 与 package.json 同步手维护
 export const SCHEMA_VERSION = 2;
 export const CONFIG_VERSION = "1";
 
diff --git a/sdk/test/business.test.ts b/sdk/test/business.test.ts
index fa2043d..0b968f9 100644
--- a/sdk/test/business.test.ts
+++ b/sdk/test/business.test.ts
@@ -427,6 +427,19 @@ describe("business / startBusinessTracking", () => {
     expect(ids).toEqual(["cf7-156", "cf7-42", "cf7-0"]);
   });
 
+  it("form_id 回归（T4 审查遗留）：11 位 ID 不截断匹配 → cf7-0（服务端 cf7-N 上限 10 位）", () => {
+    setUrl("/fid11");
+    const t = mkTransport("biz-fid11");
+    startPageSession(t);
+    startBusinessTracking(t);
+    const form = mkForm({ action: "#wpcf7-f12345678901" });
+    trusted("focusin", form.querySelector("input")!);
+    t.flush();
+    const fss = fetchedEvents("biz-fid11").filter((e) => e.event_name === "form_start");
+    expect(fss).toHaveLength(1);
+    expect(fss[0].properties.form_id).toBe("cf7-0"); // (?!\d) 拒绝截断——按解析失败归 cf7-0
+  });
+
   // ---- product_view（spec §1.3：非锚定段匹配 + onSegmentChange 切段） ----
 
   it("product_view：init 时 /product/slug/ 判定 → inferred=true rule_version=v1 + 顶层归属", () => {
diff --git a/sdk/test/index.test.ts b/sdk/test/index.test.ts
index d70f84a..5ed97ad 100644
--- a/sdk/test/index.test.ts
+++ b/sdk/test/index.test.ts
@@ -2,9 +2,11 @@ import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
 
 // index.ts 是 IIFE 打包入口：模块加载即读取全局队列、替换 g.ctk 并重放。
 // 隔离手段：vi.resetModules() + 动态 import，每用例拿到全新模块级 transport 状态。
-// startPageSession/startStayTracking 注册的 document/window 监听跨用例存留，
-// 用独立 siteId 过滤批次。0.2.0 接线（T10）：初始 page_view 由 startPageSession
-// 发（seq=1），sdk_loaded 随后入队（seq=2）——队列顺序 [page_view, sdk_loaded]。
+// startPageSession/startStayTracking/startBusinessTracking 注册的 document/window
+// 监听跨用例存留，用独立 siteId 过滤批次。0.2.0 接线（T10）：初始 page_view 由
+// startPageSession 发（seq=1），sdk_loaded 随后入队（seq=2）。0.2.1 接线（T5）：
+// startBusinessTracking 挂业务监听（产品页路径下 init 队列追加 product_view）、
+// track 补当前段归属（不再走兜底组）。
 
 type Cmd = [string, unknown?];
 type CtkFn = ((cmd: string, arg?: unknown) => void) & { q?: Cmd[] };
@@ -33,6 +35,26 @@ function bodiesOf(siteId: string) {
     .filter((b: { site_id: string }) => b.site_id === siteId);
 }
 
+/** URL 重置：走原型方法绕开历史用例的 page.ts pushState 包装——不触发旧模块
+ *  切段杂事件（同 business.test.ts setUrl 模式） */
+function setUrl(url: string) {
+  const proto = Object.getPrototypeOf(window.history) as {
+    replaceState: (data: unknown, unused: string, url?: string | URL | null) => void;
+  };
+  proto.replaceState.call(window.history, {}, "", url);
+}
+
+/** beacon 路径（contact_click 的 flush(true)）批次汇总（按信封 site_id 过滤） */
+async function beaconBodiesOf(siteId: string) {
+  const out: Record<string, any>[] = [];
+  const beacon = (navigator as unknown as { sendBeacon: ReturnType<typeof vi.fn> }).sendBeacon;
+  for (const [, blob] of beacon.mock.calls as unknown as [string, Blob][]) {
+    const body = JSON.parse(await blob.text());
+    if (body.site_id === siteId) out.push(body);
+  }
+  return out;
+}
+
 describe("index 入口", () => {
   beforeEach(() => {
     localStorage.clear();
@@ -64,7 +86,7 @@ describe("index 入口", () => {
     expect(bodies).toHaveLength(1);
     const loaded = bodies[0].events.find((e: { event_name: string }) => e.event_name === "sdk_loaded");
     expect(loaded).toBeTruthy();
-    expect(loaded.properties.sdk_version).toBe("0.2.0");
+    expect(loaded.properties.sdk_version).toBe("0.2.1");
     // build_id 由 vitest.config define 注入 "vitest"；无 define 环境兜底 "unknown"
     expect(loaded.properties.build_id).toBe("vitest");
     expect(loaded.properties.schema_version).toBe(2);
@@ -95,6 +117,76 @@ describe("index 入口", () => {
     expect(evs[0].page_id).toBe(evs[1].page_id); // 同段归属
   });
 
+  it("track 补归属（T5）：init 后 track 事件信封带顶层归属（四元组+seq+V1.1 预留位），不再走兜底组", async () => {
+    await loadSdk([["init", { siteId: "site-track", endpoint: "/e", flushMs: 60000 }]]);
+    g.ctk!("track", {
+      event_id: "e-track-1",
+      event_name: "cta_click",
+      occurred_at: new Date().toISOString(),
+      path: "/anywhere",
+      title: "t",
+      properties: { k: 1 },
+    });
+    g.ctk!("flush");
+
+    const bodies = bodiesOf("site-track");
+    // track 补当前段归属 → 与 page_view/sdk_loaded 同四元组，单组子批
+    // （兜底组路径只剩 PageSession 未启动的异常接线场景）
+    expect(bodies).toHaveLength(1);
+    const evs = bodies[0].events;
+    expect(evs.map((e: { event_name: string }) => e.event_name)).toEqual([
+      "page_view",
+      "sdk_loaded",
+      "cta_click",
+    ]);
+    const ev = evs[2] as Record<string, unknown>;
+    expect(ev.event_id).toBe("e-track-1"); // 宿主字段原样保留（归属展开在后只补/覆盖归属键）
+    expect(ev.properties).toEqual({ k: 1 });
+    expect(ev.site_id).toBe("site-track");
+    expect(ev.visitor_id).toMatch(UUID_RE);
+    expect(ev.session_id).toMatch(UUID_RE);
+    expect(ev.page_id).toBe(evs[0].page_id); // 与初始 page_view 同段
+    expect(ev.seq).toBe(3); // page_view=1、sdk_loaded=2 之后
+    expect(ev.purpose).toBe(null); // V1.1 预留位从快照展开
+    expect(ev.epoch).toBe(null);
+    expect(ev.grant_ref).toBe(null);
+  });
+
+  it("init 接线 business（T5）：产品页路径下队列 [page_view,sdk_loaded,product_view]；wa.me 点击 → contact_click beacon 冒烟", async () => {
+    setUrl("/product/hydraulic-press-100t/");
+    await loadSdk([["init", { siteId: "site-biz", endpoint: "/e", flushMs: 60000 }]]);
+    g.ctk!("flush");
+
+    const bodies = bodiesOf("site-biz");
+    expect(bodies).toHaveLength(1); // 三事件同四元组 → 单组子批
+    const evs = bodies[0].events;
+    expect(evs.map((e: { event_name: string }) => e.event_name)).toEqual([
+      "page_view",
+      "sdk_loaded",
+      "product_view",
+    ]);
+    const pv = evs[2] as Record<string, unknown>;
+    expect(pv.properties).toEqual({ product_id: "hydraulic-press-100t", inferred: true, rule_version: "v1" });
+    expect(pv.page_id).toBe(evs[0].page_id); // init 同步判定归当前段
+
+    // business 监听已装：点击 wa.me 链接 → contact_click 入队并 flush(true) beacon 送达
+    const a = document.createElement("a");
+    a.href = "https://wa.me/8613800138000";
+    document.body.appendChild(a);
+    try {
+      a.dispatchEvent(new MouseEvent("click", { bubbles: true, cancelable: true }));
+    } finally {
+      a.remove();
+    }
+    const beacons = await beaconBodiesOf("site-biz");
+    expect(beacons).toHaveLength(1);
+    const cc = beacons[0].events[0];
+    expect(cc.event_name).toBe("contact_click");
+    expect(cc.properties).toEqual({ channel: "whatsapp" });
+    expect(cc.page_id).toBe(pv.page_id); // 归属同段
+    expect(cc.site_id).toBe("site-biz");
+  });
+
   it("批次 context 含设备环境 + referrer_domain/utm/path（首触归因链路）", async () => {
     Object.defineProperty(document, "referrer", {
       value: "https://news.example/a",
@@ -224,21 +316,23 @@ describe("index 入口", () => {
     expect(g.ctk!.q).toBeUndefined(); // 桩（带 q）已被 dispatch 替换
     g.ctk!("flush");
     let bodies = bodiesOf("site-8");
-    // T8 分组拆批：归属组（page_view+sdk_loaded 同四元组）+ 兜底组（track 宿主
-    // 对象无归属顶层字段，信封走 identity 旧路径）——一次 flush 两个子批
-    expect(bodies).toHaveLength(2);
+    // T5 起 track 补当前段归属：cta_click 与 page_view/sdk_loaded 同四元组 →
+    // 单组子批（兜底组只剩 PageSession 未启动的异常接线场景）
+    expect(bodies).toHaveLength(1);
     expect(bodies[0].events.map((e: { event_name: string }) => e.event_name)).toEqual([
       "page_view",
       "sdk_loaded",
+      "cta_click",
     ]);
-    expect(bodies[1].events.map((e: { event_name: string }) => e.event_name)).toEqual(["cta_click"]);
-    expect(bodies[1].events[0].properties).toEqual({ k: 1 });
+    expect(bodies[0].events[2].properties).toEqual({ k: 1 });
+    expect(bodies[0].events[2].event_id).toBe("e-custom"); // 宿主字段原样保留
 
     // 重放结束后宿主新调用直接进 dispatch（不再排队丢失）
     g.ctk!("track", { ...trackEv, event_id: "e-2", event_name: "cta_click2" });
     g.ctk!("flush");
     bodies = bodiesOf("site-8");
-    expect(bodies).toHaveLength(3);
-    expect(bodies[2].events.map((e: { event_name: string }) => e.event_name)).toEqual(["cta_click2"]);
+    expect(bodies).toHaveLength(2);
+    expect(bodies[1].events.map((e: { event_name: string }) => e.event_name)).toEqual(["cta_click2"]);
+    expect(bodies[1].events[0].site_id).toBe("site-8"); // dispatch 直调同补归属
   });
 });