feat: 数据删除机制（purge 物理清空 + 报告页隐私区块 + 删后回同意门）+ 测试桩补 purge

scripts/verify-adaptive.ts

@@ -50,6 +50,7 @@ class MemoryStore implements EventStore {
   events: StoryEvent[] = [];
   async list(sessionId?: string) { return this.events.filter((e) => !sessionId || e.sessionId === sessionId); }
   async append(e: StoryEvent) { this.events.push(e); }
+  async purge() { this.events = []; }
 }
 class FixedJev extends MockJevClient {
   dimension: ProfileDimension;