ci: auto-publish to npm after CI passes on main

Updated publish workflow to match apple-notes-mcp pattern:
- Triggers on CI success (push to main) in addition to releases
- Skips publish if version is already on npm
- Prevents redundant publishes

.github/workflows/publish.yml

@@ -3,10 +3,17 @@ name: Publish to npm
 on:
   release:
     types: [created]
+  workflow_run:
+    workflows: [CI]
+    types: [completed]
+    branches: [main]
 
 jobs:
   publish:
     runs-on: macos-latest
+    if: >
+      (github.event_name == 'release') ||
+      (github.event_name == 'workflow_run' && github.event.workflow_run.conclusion == 'success' && github.event.workflow_run.event == 'push')
 
     steps:
       - name: Checkout repository
@@ -19,19 +26,41 @@ jobs:
           registry-url: "https://registry.npmjs.org"
           cache: "npm"
 
+      - name: Check if version is already published
+        id: check
+        run: |
+          LOCAL_VERSION=$(node -p "require('./package.json').version")
+          PUBLISHED_VERSION=$(npm view apple-mail-mcp version 2>/dev/null || echo "0.0.0")
+          echo "local=$LOCAL_VERSION" >> "$GITHUB_OUTPUT"
+          echo "published=$PUBLISHED_VERSION" >> "$GITHUB_OUTPUT"
+          if [ "$LOCAL_VERSION" = "$PUBLISHED_VERSION" ]; then
+            echo "skip=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "skip=false" >> "$GITHUB_OUTPUT"
+          fi
+
       - name: Install dependencies
+        if: steps.check.outputs.skip == 'false'
         run: npm ci
 
       - name: Run linter
+        if: steps.check.outputs.skip == 'false'
         run: npm run lint
 
       - name: Run tests
+        if: steps.check.outputs.skip == 'false'
         run: npm test
 
       - name: Build
+        if: steps.check.outputs.skip == 'false'
         run: npm run build
 
       - name: Publish to npm
+        if: steps.check.outputs.skip == 'false'
         run: npm publish
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+      - name: Skip publish (version already published)
+        if: steps.check.outputs.skip == 'true'
+        run: echo "Version ${{ steps.check.outputs.local }} is already published. Skipping."