chore: fix eslint errors introduced across phases 1-3

apps/agent-worker/src/runtime/docker.ts

@@ -244,7 +244,9 @@ export const inspectUserBoxStatus = async (
   const running = runningField === 'true';
   return {
     running,
+    // eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing -- empty field means "no image"
     image: imageField || null,
+    // eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing -- empty field means "not started"
     startedAt: running ? startedAtField || null : null,
     memoryLimitBytes: Number(memoryField) || null,
   };