feat(coding-agent): add provider payload hook

packages/coding-agent/examples/extensions/provider-payload.ts

@@ -0,0 +1,14 @@
+import { appendFileSync } from "node:fs";
+import { join } from "node:path";
+import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
+
+export default function (pi: ExtensionAPI) {
+	const logFile = join(process.cwd(), ".pi", "provider-payload.log");
+
+	pi.on("before_provider_request", (event) => {
+		appendFileSync(logFile, `${JSON.stringify(event.payload, null, 2)}\n\n`, "utf8");
+
+		// Optional: replace the payload instead of only logging it.
+		// return { ...event.payload, temperature: 0 };
+	});
+}