feat(decimal): add example project with Vite configuration and TypeScript support

- Created tsconfig.json for the decimal example, extending the base configuration and including Vite types.
- Added vite.config.ts to set up Vite with Hikkaku plugin for the decimal example.
- Updated turbo.json to include the new decimal example in the build process.

Author: Kicky1618

AGENTS.md

@@ -8,6 +8,7 @@
 - `packages/skill/` contains skill docs and guides (`guides/`, `practices/`).
 - `packages/testing/` provides Vitest-oriented Hikkaku + MoonScratch test helpers.
 - `examples/example1/` is the dev playground app for running the library with Vite.
+- `examples/decimal/` demonstrates V8-oriented arbitrary-precision decimal arithmetic in Scratch.
 - Root configs: `biome.json`, `tsconfig.json`, and workspace `package.json`.
 
 ## AGENTS.md Maintenance Policy

bun.lock

@@ -0,0 +1 @@
+../../../../packages/skill/hikkaku

examples/decimal/.agents/skills/hikkaku

@@ -0,0 +1,3 @@
+* `src/main.ts`: The main entry point of the application.
+
+* use `bun typecheck` to run type checking.

examples/decimal/AGENTS.md

@@ -0,0 +1,25 @@
+{
+  "name": "@repo/example-decimal",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "bun run example:build",
+    "typecheck": "tsgo",
+    "example:build": "bun --bun vite build"
+  },
+  "dependencies": {
+    "hikkaku": "workspace:*"
+  },
+  "devDependencies": {
+    "@typescript/native-preview": "^7.0.0-dev.20260127.1",
+    "vite": "8.0.0-beta.14"
+  },
+  "exports": {
+    ".": "./src/main.ts"
+  },
+  "author": {
+    "name": "Kingping",
+    "url": "https://scratch.mit.edu/users/Kangping/"
+  }
+}