chore: migrate from npm to pnpm

- Update CI and release workflows to use pnpm
- Add packageManager field to package.json
- Replace package-lock.json with pnpm-lock.yaml
- Update CLAUDE.md and CONTRIBUTING.md to reference pnpm commands
- Remove @sanity-labs/ prefix from package name reference

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kmelve

.github/workflows/ci.yml

@@ -16,24 +16,27 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: ['20', '22']
+        node: ['22', '24']
     steps:
       - uses: actions/checkout@v4
 
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node }}
-          cache: 'npm'
+          cache: 'pnpm'
 
       - name: Install dependencies
-        run: npm ci
+        run: pnpm install --frozen-lockfile
 
       - name: Type check
-        run: npm run typecheck
+        run: pnpm typecheck
 
       - name: Build
-        run: npm run build
+        run: pnpm build
 
       - name: Test
-        run: npm run test:run
+        run: pnpm test:run

.github/workflows/release.yml

@@ -22,28 +22,31 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
           node-version: '22'
-          cache: 'npm'
+          cache: 'pnpm'
           registry-url: 'https://registry.npmjs.org'
 
       - name: Install dependencies
-        run: npm ci
+        run: pnpm install --frozen-lockfile
 
       - name: Build
-        run: npm run build
+        run: pnpm build
 
       - name: Test
-        run: npm run test:run
+        run: pnpm test:run
 
       - name: Create Release Pull Request or Publish
         id: changesets
         uses: changesets/action@v1
         with:
-          publish: npx changeset publish
-          version: npx changeset version
+          publish: pnpm release
+          version: pnpm changeset version
           title: 'chore: version packages'
           commit: 'chore: version packages'
         env:

CLAUDE.md

@@ -4,7 +4,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Project Overview
 
-**boxfix** (`@sanity-labs/boxfix`) is a CLI tool and library that fixes misaligned ASCII diagram borders in markdown files. LLMs often generate diagrams where content lines are shorter than boundary lines - this tool detects and pads those lines to proper width.
+**boxfix** is a CLI tool and library that fixes misaligned ASCII diagram borders in markdown files. LLMs often generate diagrams where content lines are shorter than boundary lines - this tool detects and pads those lines to proper width.
 
 ## Workflow
 
@@ -27,14 +27,14 @@ See [CONTRIBUTING.md](./CONTRIBUTING.md) for detailed guidelines.
 
 ```bash
 # Build (uses tsup)
-npm run build
+pnpm build
 
 # Run tests
-npm test              # Watch mode
-npm run test:run      # Single run
+pnpm test              # Watch mode
+pnpm test:run          # Single run
 
 # Type checking
-npm run typecheck
+pnpm typecheck
 
 # CLI usage (after build)
 ./dist/cli.js input.md              # Output to stdout

CONTRIBUTING.md

@@ -19,17 +19,17 @@ Thank you for your interest in contributing to boxfix! This document provides gu
 
 2. Install dependencies:
    ```bash
-   npm install
+   pnpm install
    ```
 
 3. Build the project:
    ```bash
-   npm run build
+   pnpm build
    ```
 
 4. Run tests to verify setup:
    ```bash
-   npm run test:run
+   ppnpm test:run
    ```
 
 ## Development Workflow
@@ -52,9 +52,9 @@ The `main` branch is protected with the following rules:
    ```
 
 2. Make your changes, ensuring:
-   - Tests pass: `npm run test:run`
-   - Types check: `npm run typecheck`
-   - Build succeeds: `npm run build`
+   - Tests pass: `ppnpm test:run`
+   - Types check: `pnpm typecheck`
+   - Build succeeds: `pnpm build`
 
 3. Commit using [conventional commits](#commit-conventions)
 
@@ -117,8 +117,8 @@ examples/             # Before/after diagram examples
 ### Running Tests
 
 ```bash
-npm test              # Watch mode
-npm run test:run      # Single run (CI)
+pnpm test              # Watch mode
+ppnpm test:run      # Single run (CI)
 ```
 
 ### Writing Tests
@@ -183,7 +183,7 @@ Releases are managed through [Changesets](https://github.com/changesets/changese
 
 1. Create a changeset when making user-facing changes:
    ```bash
-   npm run changeset
+   pnpm changeset
    ```
 
 2. Follow the prompts to describe your changes