pipeline executor improvements, proxy refresh, task runner step list

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/servers/api/tasks/pipeline-job-manager.ts

@@ -67,6 +67,8 @@ type StartJobParams = {
   inputs: Record<string, string>;
   cwd?: string;
   config: unknown;
+  model?: string;
+  startAt?: number;
 };
 
 export async function startJob(params: StartJobParams): Promise<string> {
@@ -146,6 +148,8 @@ export async function startJob(params: StartJobParams): Promise<string> {
     taskDirName: params.taskDirName,
     inputs: params.inputs,
     cwd: params.cwd,
+    model: params.model,
+    startAt: params.startAt,
     abortSignal: job.abortSignal,
     emit,
   }).then(async () => {