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feat: v1.5 TTL 惰性淘汰（LIMITATIONS #11 闭环）+ 文档口径收尾 - #11
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目的
闭环 LIMITATIONS #11：
evict_expired早已实现且有测试，但网关主进程没有任何触发器，会话表随运行时间无界增长。方案：惰性淘汰（读写顺手触发，无后台线程）
SessionStore.maybe_evict()：在get_or_create（每个正常请求的必经路径）顺手触发淘汰_EVICT_INTERVAL）：两次全表扫描至少间隔 60 秒，避免每请求一次扫描；_last_evict竞写良性（最坏多扫一次），不加锁evict_expired取的是同一把非可重入threading.Lock，若在get_or_create临界区内调用必死锁——已在代码注释中写明回归测试（2 项，测试 44 → 46 全过 + 11 项冒烟全过）
test_lazy_eviction_throttled：首次淘汰 1 个超时会话 → 窗口内新超时会话不扫（返回 0）→ 窗口过后恢复淘汰test_get_or_create_triggers_lazy_eviction：任意流量触发，超时会话被 archive、活跃会话不受影响文档同步
验证
python -m unittest tests.test_offline46 项 OK；python tools/smoke_e2e.py11/11 通过（Python 3.13）