[General] Session artifact & todo cleanup?

**Mood:** 😊
**Category:** General

Session artifact & todo cleanup? During a long refactor in one session, plan/scratch files accrued and I had to manually request cleanup. Completed todos also kept piling up (stuck at 27/27 done but still accumulating). Unclear which layer should handle this.

---
| Field | Value |
| --- | --- |
| App version | 0.2.34 |
| OS | Windows 10.0.26200 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Week 2 |

No files, tests, or entry points are named. Start by tracing the /chat session lifecycle and where plan/scratch artifacts and completed todos are stored or displayed. Done means the issue defines and verifies automatic cleanup without removing active work or allowing completed todos to accumulate.

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