✨ feat: add SQLite persistence, multi-tenancy, auto-sync, and CI/Docker improvements (#1)

Replace in-memory storage with SQLite (WAL mode), add workspace-based
multi-tenancy with auto-detection via server.listRoots(), and embed the
canvas server into the MCP process for single-process operation.

🔧 Core enhancements:
- SQLite persistence with versioning, element history, and search
- Multi-tenancy: isolated canvases per workspace (SHA-256 tenant IDs)
- Embedded canvas lifecycle (single node process starts MCP + canvas)
- Auto-sync with 3s debounce and manual override toggle
- Configurable canvas port via CANVAS_PORT env var
- 6 new MCP tools (search, history, tenants, projects)
- Workspace switcher UI with dropdown search
- Sync normalization to prevent bound-text breakage on reload

🐳 Docker & CI improvements:
- BuildKit cache mounts for faster npm installs across builds
- Skip native compilation in frontend-builder stage (--ignore-scripts)
- Build only linux/amd64 on PRs, multi-arch on push to main
- Docker Hub registry with proper build tools for better-sqlite3
- CI and Docker status check gates (github/ci-status-check, github/docker-build-check)

📦 Package & publishing:
- Renamed to @sanjibdevnath/mcp-excalidraw-local (v3.0.0)
- Updated npm-publish workflow for scoped package
- Updated bin entry, keywords, and files list

📝 Documentation:
- README with UI screenshots, architecture diagram, and full feature docs
- Updated agent skill with 32-tool cheatsheet and workflow playbooks
- Fork attribution and upstream comparison table

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/npm-publish.yml

@@ -53,7 +53,7 @@ jobs:
       - name: Check if version exists on NPM
         id: check-version
         run: |
-          if npm view mcp-excalidraw-server@${{ steps.package-version.outputs.version }} version 2>/dev/null; then
+          if npm view @sanjibdevnath/mcp-excalidraw-local@${{ steps.package-version.outputs.version }} version 2>/dev/null; then
             echo "exists=true" >> $GITHUB_OUTPUT
             echo "Version ${{ steps.package-version.outputs.version }} already exists on NPM"
           else
@@ -82,14 +82,14 @@ jobs:
       - name: Create GitHub Release Assets
         if: github.event_name == 'release'
         run: |
-          tar -czf mcp-excalidraw-server-${{ steps.package-version.outputs.version }}.tar.gz dist/
+          tar -czf mcp-excalidraw-local-${{ steps.package-version.outputs.version }}.tar.gz dist/
 
       - name: Upload Release Assets
         if: github.event_name == 'release'
         uses: softprops/action-gh-release@v1
         with:
           files: |
-            mcp-excalidraw-server-${{ steps.package-version.outputs.version }}.tar.gz
+            mcp-excalidraw-local-${{ steps.package-version.outputs.version }}.tar.gz
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
@@ -103,4 +103,4 @@ jobs:
       - name: Success notification
         run: |
           echo "✅ Package successfully published to NPM!"
-          echo "View at: https://www.npmjs.com/package/mcp-excalidraw-server"
+          echo "View at: https://www.npmjs.com/package/@sanjibdevnath/mcp-excalidraw-local"