test: move embedded and tool agent suites out of e2e

src/agents/pi-embedded-runner.createsystempromptoverride.test.ts

@@ -0,0 +1,14 @@
+import { describe, expect, it } from "vitest";
+import { createSystemPromptOverride } from "./pi-embedded-runner.js";
+
+describe("createSystemPromptOverride", () => {
+  it("returns the override prompt trimmed", () => {
+    const override = createSystemPromptOverride("OVERRIDE");
+    expect(override()).toBe("OVERRIDE");
+  });
+
+  it("returns an empty string for blank overrides", () => {
+    const override = createSystemPromptOverride("  \n  ");
+    expect(override()).toBe("");
+  });
+});