feat(pi-workflow): reuse standard agent profiles

extensions/pi-workflow/execution.test.ts

@@ -415,6 +415,12 @@ test("mutating children receive guarded file tools without process execution", a
     ).profiles;
     const profile = profiles.find((candidate) => candidate.roles.includes("implement"));
     assert.ok(profile);
+    const standardWorker = {
+      ...profile,
+      name: "worker",
+      source: "standard-package" as const,
+      tools: [...(profile.tools ?? []), "bash", "subagent"],
+    };
     const inherited = model("provider-a", "parent");
     const executor = new PiAssignmentExecutor({
       modelRegistry: registry([inherited]),
@@ -476,7 +482,7 @@ test("mutating children receive guarded file tools without process execution", a
       runId: "run-mutation",
       role: "design",
       request: "Generate an owned file",
-      profile,
+      profile: standardWorker,
       facts: {
         stage: "design",
         taskKind: "feature",