fix(coding-agent,tui): drop typebox compiler shim and fix progress

packages/coding-agent/examples/extensions/README.md

@@ -140,7 +140,7 @@ See [docs/extensions.md](../../docs/extensions.md) for full documentation.
 
 ```typescript
 import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
-import { Type } from "@sinclair/typebox";
+import { Type } from "typebox";
 
 export default function (pi: ExtensionAPI) {
   // Subscribe to lifecycle events

packages/coding-agent/examples/extensions/structured-output.ts

@@ -7,7 +7,7 @@
 
 import { defineTool, type ExtensionAPI } from "@mariozechner/pi-coding-agent";
 import { Text } from "@mariozechner/pi-tui";
-import { Type } from "@sinclair/typebox";
+import { Type } from "typebox";
 
 interface StructuredOutputDetails {
 	headline: string;