chore: add playground workspace for manual testing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: branchseer

playground/README.md

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+# Playground
+
+A workspace for manually testing `vp run` (the task runner).
+
+## Structure
+
+```
+playground/
+├── packages/
+│   ├── app/       → depends on @playground/lib
+│   ├── lib/       → depends on @playground/utils
+│   └── utils/     → no dependencies
+└── vite-task.json → workspace-level task config
+```
+
+Dependency chain: `app → lib → utils`
+
+## Scripts & Tasks
+
+Tasks are defined in each package's `vite-task.json` with caching enabled. `dev` is a package.json script (not cached).
+
+| Name        | Type   | Packages        | Cached | Description                                    |
+| ----------- | ------ | --------------- | ------ | ---------------------------------------------- |
+| `build`     | task   | app, lib, utils | yes    | Prints a build message                         |
+| `test`      | task   | app, lib, utils | yes    | Prints a test message                          |
+| `lint`      | task   | app, lib, utils | yes    | Prints a lint message                          |
+| `typecheck` | task   | app, lib        | yes    | Prints a typecheck message                     |
+| `dev`       | script | app, lib        | no     | Long-running process (prints every 2s, ctrl-c) |

playground/package.json

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+{
+  "name": "playground",
+  "private": true
+}

playground/packages/app/build.mjs

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+console.log('Building app');

playground/packages/app/dev.mjs

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+process.on('SIGINT', () => {
+  console.log('app: dev server stopped');
+  process.exit(0);
+});
+
+setInterval(() => console.log('app: waiting for changes...'), 2000);

playground/packages/app/lint.mjs

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+console.log('Linting app');

playground/packages/app/package.json

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+{
+  "name": "@playground/app",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "dev": "node dev.mjs"
+  },
+  "dependencies": {
+    "@playground/lib": "workspace:*"
+  }
+}

playground/packages/app/src/index.ts

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+import { sum } from '@playground/lib';
+
+console.log(sum(1, 2, 3));

playground/packages/app/test.mjs

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+console.log('Testing app');

playground/packages/app/typecheck.mjs

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+console.log('Typechecking app');

playground/packages/app/vite-task.json

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+{
+  "tasks": {
+    "build": {
+      "command": "node build.mjs"
+    },
+    "test": {
+      "command": "node test.mjs"
+    },
+    "typecheck": {
+      "command": "node typecheck.mjs"
+    },
+    "lint": {
+      "command": "node lint.mjs"
+    }
+  }
+}