Add changeset check workflow and update documentation

- Create changeset-check.yml workflow to verify PRs include changesets
- Update .github/WORKFLOWS.md with changeset check documentation
- Add skip-changeset label support for PRs that don't need changesets

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

.github/WORKFLOWS.md

@@ -172,7 +172,34 @@ graph LR
 
 **Note**: See [CONTRIBUTING.md](../CONTRIBUTING.md#versioning-and-releases) for details on creating changesets.
 
-### 9. Stale Issues & PRs
+### 9. Changeset Check
+
+**File**: `changeset-check.yml`  
+**Triggers**: Pull Requests (opened, synchronized, labeled)
+
+Ensures PRs that modify packages include a changeset.
+
+**What It Does**:
+- Checks if PR modifies any files in `packages/`
+- Verifies a changeset file exists (`.changeset/*.md`)
+- Fails the check if changeset is missing
+- Can be skipped with `skip-changeset` or `dependencies` label
+
+**When to Skip**:
+- Documentation-only changes
+- Changes to examples or apps
+- Test-only updates
+- Automated dependency updates (Dependabot)
+
+**How to Pass**:
+1. Run `pnpm changeset` locally
+2. Follow the prompts to create a changeset
+3. Commit the generated `.changeset/*.md` file
+4. OR add `skip-changeset` label if not needed
+
+This workflow helps maintain consistent versioning and comprehensive changelogs.
+
+### 10. Stale Issues & PRs
 
 **File**: `stale.yml`  
 **Triggers**: Daily schedule, Manual workflow dispatch
@@ -185,7 +212,7 @@ Manages stale issues and pull requests.
 - Exempt labels: `pinned`, `security`, `critical`, `bug`, `enhancement`
 - Can be reopened if activity resumes
 
-### 10. Dependabot Auto-merge
+### 11. Dependabot Auto-merge
 
 **File**: `dependabot-auto-merge.yml`  
 **Configuration**: `dependabot.yml`  
@@ -204,7 +231,7 @@ Automatically manages dependency updates.
 - Groups related dependencies
 - Limits to 10 open PRs
 
-### 11. Auto Changelog
+### 12. Auto Changelog
 
 **File**: `changelog.yml`  
 **Triggers**: Release published, Manual workflow dispatch

.github/workflows/changeset-check.yml

@@ -0,0 +1,57 @@
+name: Changeset Check
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+
+jobs:
+  check:
+    name: Check for Changeset
+    runs-on: ubuntu-latest
+    # Skip this check if PR has 'skip-changeset' label or only changes non-package files
+    if: |
+      !contains(github.event.pull_request.labels.*.name, 'skip-changeset') &&
+      !contains(github.event.pull_request.labels.*.name, 'dependencies')
+    
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20.x'
+          cache: 'pnpm'
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Check for changesets
+        run: |
+          # Check if there are any changesets
+          if [ ! "$(ls -A .changeset/*.md 2>/dev/null | grep -v 'README.md')" ]; then
+            # Check if any package files were changed
+            if git diff --name-only origin/${{ github.base_ref }}...HEAD | grep -q '^packages/'; then
+              echo "❌ This PR modifies packages but doesn't include a changeset"
+              echo ""
+              echo "To add a changeset, run: pnpm changeset"
+              echo ""
+              echo "If this PR doesn't need a changeset (docs only, etc.),"
+              echo "add the 'skip-changeset' label to the PR"
+              echo ""
+              echo "📚 Learn more: https://github.com/objectstack-ai/objectui/blob/main/CONTRIBUTING.md#versioning-and-releases"
+              exit 1
+            else
+              echo "✅ No package changes detected, skipping changeset check"
+            fi
+          else
+            echo "✅ Changeset found"
+          fi
+