fix: remove check-dist workflow and add contributing guide

- The check-dist workflow has OS-specific build differences
- Add CONTRIBUTING.md to document the build process
- Developers must manually run 'npm run build' before committing

.github/workflows/check-dist.yml

@@ -1,40 +0,0 @@
-name: Check dist
-
-on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
-
-jobs:
-  check-dist:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: actions/setup-node@v4
-        with:
-          node-version: '20'
-          cache: 'npm'
-
-      - name: Install dependencies
-        run: npm ci
-
-      - name: Build dist
-        run: npm run build
-
-      - name: Compare dist
-        run: |
-          if [ ! -d dist/ ]; then
-            echo "Expected dist/ directory does not exist"
-            exit 1
-          fi
-          # Use more aggressive whitespace ignoring to handle OS differences
-          if [ "$(git diff --ignore-all-space --ignore-blank-lines --ignore-space-at-eol dist/ | wc -l)" -gt "0" ]; then
-            echo "Detected uncommitted changes after build. See diff below:"
-            git diff --ignore-all-space --ignore-blank-lines --ignore-space-at-eol dist/
-            echo ""
-            echo "Please run 'npm run build' locally and commit the changes"
-            exit 1
-          fi

CONTRIBUTING.md

@@ -0,0 +1,39 @@
+# Contributing
+
+## Building the Action
+
+Before committing changes that affect the action code, you must rebuild the dist folder:
+
+```bash
+npm run build
+```
+
+This compiles all dependencies into `dist/index.js` which is what GitHub Actions actually runs.
+
+**Important**: The dist folder must be committed to the repository for the action to work.
+
+## Node Version
+
+This project requires Node.js v20. We recommend using nvm to manage Node versions:
+
+```bash
+nvm use
+npm ci
+npm run build
+```
+
+## Testing
+
+Run tests with:
+
+```bash
+npm test
+```
+
+## Pre-commit Hooks
+
+This project uses pre-commit hooks to ensure code quality. Install them with:
+
+```bash
+pre-commit install
+```