fix(typebox): migrate to v1 with extension compat (#3474)

* fix(typebox): migrate to v1 with extension compat

Replace AJV-based validation with TypeBox-native validation, keep legacy extension imports working (including @sinclair/typebox/compiler), and restore coercion for serialized/plain JSON schemas.

This change closes #3112.

* fix(typebox): use canonical imports and harden coercion

Switch first-party code to canonical typebox imports while retaining legacy extension aliases in the loader.

Remove obsolete runtime codegen guards, expand serialized JSON-schema coercion coverage, and update related tests and fixtures.

Fixes #3112.

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Co-authored-by: Mario Zechner <badlogicgames@gmail.com>

packages/ai/test/google-tool-call-missing-args.test.ts

@@ -1,4 +1,4 @@
-import { Type } from "@sinclair/typebox";
+import { Type } from "typebox";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { streamGoogleGeminiCli } from "../src/providers/google-gemini-cli.js";
 import type { Context, Model, ToolCall } from "../src/types.js";