Fail context migration when upload is unavailable

docs/ocsentinel-deployment.md

@@ -130,9 +130,10 @@ The script has no script variables and does the following safely:
 2. stores the current NinjaOne organization, location, node, and machine values;
 3. starts one signed status scan and upload using that stored context.
 
-Expected output includes `OCSENTINEL_NINJA_CONTEXT=updated`. Do not run this
-script from an interactive PowerShell session, because NinjaOne does not expose
-the required environment values there.
+Expected output includes `OCSENTINEL_NINJA_CONTEXT=updated`; this is emitted
+only after the immediate upload succeeds. Do not run this script from an
+interactive PowerShell session, because NinjaOne does not expose the required
+environment values there.
 
 ## Secret Bootstrap