feat(sdk): 版本注入与事件归属骨架（0.2.0/build_id/schema_version）

Co-Authored-By: Claude Code <noreply@anthropic.com>

sdk/test/index.test.ts

@@ -54,7 +54,7 @@ describe("index 入口", () => {
     delete (document as { referrer?: string }).referrer;
   });
 
-  it("init 后 sdk_loaded 入队（含 sdk_version）", async () => {
+  it("init 后 sdk_loaded 入队（含版本组：sdk_version/build_id/schema_version/config_version）", async () => {
     await loadSdk([["init", { siteId: "site-1", endpoint: "/e", flushMs: 60000 }]]);
     g.ctk!("flush");
 
@@ -62,7 +62,11 @@ 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("0.1.0");
+    expect(loaded.properties.sdk_version).toBe("0.2.0");
+    // 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);
+    expect(loaded.properties.config_version).toBe("1");
     expect(loaded.event_id).toMatch(UUID_RE);
   });