refactor: remove role metadata from subagent artifacts

src/process-runner.test.ts

@@ -30,8 +30,6 @@ test("createProcessSingleRunner launches wrapper without tmux and returns monito
             {
               runId: meta.runId,
               mode: meta.mode,
-              agent: meta.agent,
-              agentSource: meta.agentSource,
               task: meta.task,
               requestedModel: meta.requestedModel,
               resolvedModel: meta.resolvedModel,
@@ -60,8 +58,6 @@ test("createProcessSingleRunner launches wrapper without tmux and returns monito
     cwd,
     meta: {
       mode: "single",
-      agent: "scout",
-      agentSource: "builtin",
       task: "inspect auth",
       requestedModel: "openai/gpt-5",
       resolvedModel: "openai/gpt-5",
@@ -95,8 +91,6 @@ test("createProcessSingleRunner writes error result.json when wrapper launch fai
     cwd,
     meta: {
       mode: "single",
-      agent: "scout",
-      agentSource: "builtin",
       task: "inspect auth",
       requestedModel: "openai/gpt-5",
       resolvedModel: "openai/gpt-5",
@@ -109,5 +103,6 @@ test("createProcessSingleRunner writes error result.json when wrapper launch fai
 
   const saved = JSON.parse(await readFile(result.resultPath!, "utf8"));
   assert.equal(saved.exitCode, 1);
+  assert.equal("agent" in saved, false);
   assert.match(saved.errorMessage ?? "", /spawn boom/);
 });