add per-agent smoke tests (#100)

test/fixtures/gemini-effort.ts

@@ -0,0 +1,27 @@
+import type { Effort, Payload } from "../../external.ts";
+
+/**
+ * Test fixture for Gemini effort levels.
+ * Runs all three effort levels in sequence.
+ *
+ * Run with:
+ *   AGENT_OVERRIDE=gemini pnpm play gemini-effort.ts
+ *
+ * Effort levels:
+ *   - "mini": gemini-2.5-flash + LOW thinking
+ *   - "auto": gemini-2.5-flash + HIGH thinking
+ *   - "max": gemini-2.5-pro + HIGH thinking
+ */
+
+const efforts: Effort[] = ["mini", "auto", "max"];
+
+export default efforts.map((effort) => ({
+  "~pullfrog": true,
+  agent: "gemini",
+  prompt: "What is 2 + 2? Reply with just the number.",
+  event: {
+    trigger: "workflow_dispatch",
+  },
+  modes: [],
+  effort,
+})) satisfies Payload[];