feat(coding-agent): add bash spawn hook

packages/coding-agent/examples/extensions/bash-spawn-hook.ts

@@ -0,0 +1,30 @@
+/**
+ * Bash Spawn Hook Example
+ *
+ * Adjusts command, cwd, and env before execution.
+ *
+ * Usage:
+ *   pi -e ./bash-spawn-hook.ts
+ */
+
+import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
+import { createBashTool } from "@mariozechner/pi-coding-agent";
+
+export default function (pi: ExtensionAPI) {
+	const cwd = process.cwd();
+
+	const bashTool = createBashTool(cwd, {
+		spawnHook: ({ command, cwd, env }) => ({
+			command: `source ~/.profile\n${command}`,
+			cwd,
+			env: { ...env, PI_SPAWN_HOOK: "1" },
+		}),
+	});
+
+	pi.registerTool({
+		...bashTool,
+		execute: async (id, params, onUpdate, _ctx, signal) => {
+			return bashTool.execute(id, params, signal, onUpdate);
+		},
+	});
+}