Sprite stuck cold, restart returns conflict

Sprite rg-dev-1-1 (id sprite-72c443b9-9745-4718-8a2f-016b64a47db6, runtime 0.0.5) has been unreachable since about 15:45 UTC on 15 Nov 2026. It worked normally from 14:13 to 15:43 UTC, went cold, and has not woken since.

- The status API shows cold, with last_running_at and last_warming_at null.
- Exec WebSockets time out on the opening handshake.
- Its URL returns 502 after about 40 s.
- GET /v1/sprites/rg-dev-1-1/checkpoints returns 502 after 40 s (request id cc4f02d0-0ac4-427e-bd3b-c56ead109d69).
- The dashboard restart is rejected: “The upstream service rejected the restart … due to a conflict or unmet precondition.”

Another Sprite in the same org (rg-dev-313-122) works normally. The disk holds state I need, so please recover it rather than recreate it. Could you also say what caused it (host, capacity, wedge,…), and whether there’s a way to detect this from the API so my backend can react?