Expose monotonic generation progress update boundary

app/generation/services/generation_service.py

@@ -375,6 +375,22 @@ class GenerationService:
             product_surface=original_request.product_surface,
         )
 
+    async def update_progress(
+        self,
+        workspace_id: str,
+        user_id: str,
+        job_id: str,
+        progress_percent: int,
+    ) -> GenerationJobView:
+        self.ensure_ready()
+        job = await self.repository.update_progress(
+            workspace_id,
+            job_id,
+            user_id=user_id,
+            progress_percent=progress_percent,
+        )
+        return GenerationJobView.from_record(job)
+
     async def list_job_attempts(
         self, workspace_id: str, user_id: str, job_id: str
     ) -> list[GenerationJobAttemptView]: