Document service job durability contract

docs/LOCAL-SERVICE-API.md

@@ -87,7 +87,8 @@ run directory; the assessment result itself is still reported separately as
 
 ### `GET /runs`
 
-Lists known in-memory jobs for the current service process.
+Lists known in-memory jobs for the current service process. Job records are not
+durable across service restarts.
 
 ### `GET /runs/{job_id}`
 
@@ -111,4 +112,5 @@ podman run --rm -p 8080:8080 \
 ```
 
 The service keeps job state in memory. Durable run evidence remains in the
-mounted output directory.
+mounted output directory. See `docs/SERVICE-JOB-DURABILITY.md` for the explicit
+restart and recovery contract.