chore: add MIT LICENSE and document ref submodule commits

- Add MIT LICENSE file (copyright Minsu Lee)
- Update root package.json license from ISC to MIT
- Document pinned commit hashes for ref/ submodules in CLAUDE.md

Author: amondnet

CLAUDE.md

@@ -41,6 +41,17 @@ cd packages/layer && bun typecheck
 - **`ref/`** - Git submodules containing reference projects (docus, shadcn-vue, fumadocs)
 - **`docs/ref-analysis.md`** - Analysis summary of Docus and shadcn-vue reference projects
 
+#### Reference Submodules (pinned commits)
+
+| Submodule | Repository | Commit | Version |
+| --- | --- | --- | --- |
+| `ref/content` | [nuxt/content](https://github.com/nuxt/content) | `fbfd05b3aa1c6c500417d99ddbfe524936cfaa7b` | v3.9.0 |
+| `ref/docus` | [nuxt-content/docus](https://github.com/nuxt-content/docus) | `0eafdaaa7050f0703dc89565c8bdb4622b22bb77` | v5.4.1-2-g0eafdaaa |
+| `ref/fumadocs` | [fuma-nama/fumadocs](https://github.com/fuma-nama/fumadocs) | `7e820e27169ec7ece54b8e54d365fe1ba78f84d4` | create-fumadocs-app@16.0.19-29-g7e820e271 |
+| `ref/mdc` | [nuxt-content/mdc](https://github.com/nuxt-content/mdc) | `d4483f6d85830232fd647d44daa67ef4f2b0ebc3` | v0.19.1 |
+| `ref/shadcn-vue` | [unovue/shadcn-vue](https://github.com/unovue/shadcn-vue) | `1e2fe1769cf5bfd75a4f8d716fb26fb3ef2a2f02` | v2.3.3-25-g1e2fe176 |
+| `ref/ui` | [nuxt/ui](https://github.com/nuxt/ui) | `8dc6b222c9a3f265073a25e04f105c42c33aacc9` | v4.2.1-35-g8dc6b222c |
+
 ### Layer Package (`packages/layer`)
 
 The `@pleaseai/docs` is a Nuxt 4 layer that provides:

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Minsu Lee
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

package.json

@@ -4,7 +4,7 @@
   "packageManager": "bun@1.3.5",
   "description": "",
   "author": "",
-  "license": "ISC",
+  "license": "MIT",
   "homepage": "https://github.com/pleaseai/docs#readme",
   "repository": {
     "type": "git",