chore(vendor): import pi 1.3.0

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/packages/coding-agent/test/rpc-example.ts

@@ -7,7 +7,7 @@ const __dirname = dirname(fileURLToPath(import.meta.url));
 
 /**
  * Interactive example of using coding-agent via RpcClient.
- * Usage: npx tsx test/rpc-example.ts
+ * Usage: node test/rpc-example.ts
  */
 
 async function main() {