chore(vendor): import pi 0.85.1

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: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/packages/coding-agent/src/rpc-entry.ts

@@ -0,0 +1,13 @@
+#!/usr/bin/env node
+import { APP_NAME } from "./config.ts";
+import { configureHttpDispatcher } from "./core/http-dispatcher.ts";
+import { main } from "./main.ts";
+
+process.title = `${APP_NAME}-rpc`;
+process.env.PI_CODING_AGENT = "true";
+process.env.AI_AGENT = "pi";
+process.emitWarning = (() => {}) as typeof process.emitWarning;
+
+configureHttpDispatcher();
+
+main(["--mode", "rpc", ...process.argv.slice(2)]);