dsh-testing

Design and run tests for DeepSeek Harness (dsh) changes — choosing the right tier (unit/coverage/e2e/snapshot/web), writing real-composition and smoke tests, snapshot record/refresh workflow, and coverage-gate rules in the deepseek-harness repo. Use this whenever the user adds or changes tests, asks which checks to run for a dsh change, hits a coverage or snapshot gate failure, or says "写测试"/"跑哪些测试"/"快照怎么更新" about…