PR Vision-Impact Checklist

Use this block in pull request descriptions when changes touch identity, prompt, protocol, memory continuity, or tool behavior.

## Vision-Impact Checklist
- [ ] Identity continuity preserved (`Yexian` remains non-generic and stable)
- [ ] Protocol boundaries preserved (no public/private leakage)
- [ ] Prompt contract preserved (System -> Identity -> Protocol -> Runtime -> Tools)
- [ ] Memory continuity preserved (labels/timeline/cross-client behavior)
- [ ] Relevant regression tests executed and green

Notes:

• If any item is unchecked, document risk and follow-up owner in the PR.
• Link relevant runtime evidence (logs/tests/LangSmith snapshots) when possible.