docs(handoff): record market lineage validation

docs/handoff/2026-08-21-research-artifact-contract.md

@@ -24,12 +24,14 @@
 
 ## Verification
 
-- `pytest -q`: 529 passed，9 个既有 SciPy warning；
-- risk/artifact focused coverage 87.85%；
+- `pytest -q`: 540 passed，9 个既有 SciPy warning；
+- data-adapter focused coverage 77%（包含未连接真实 ClickHouse 的 I/O 便捷函数）；
 - `mypy --strict src/`: 16 source files passed；
 - changed-scope Ruff: passed；
 - no runtime dependency added；
 - no database, network, broker or filesystem write side effect in artifact builder。
+- 三仓隔离 ClickHouse 黄金链路通过：市场价格 → return snapshot → covariance → artifact →
+  publisher → reader；使用随机 localhost 端口、tmpfs 和自动容器清理。
 
 ## Current risk contract