feat(v2.7.0): add n8n_update_partial_workflow with transactional updates

BREAKING CHANGES:
- Renamed n8n_update_workflow to n8n_update_full_workflow for clarity

NEW FEATURES:
- Added n8n_update_partial_workflow tool for diff-based workflow editing
- Implemented WorkflowDiffEngine with 13 operation types
- Added transactional updates with two-pass processing
- Maximum 5 operations per request for reliability
- Operations can be in any order - engine handles dependencies
- Added validateOnly mode for testing changes before applying
- 80-90% token savings by only sending changes

IMPROVEMENTS:
- Enhanced tool description with comprehensive parameter documentation
- Added clear examples for simple and complex use cases
- Improved error messages and validation
- Added extensive test coverage for all operations

DOCUMENTATION:
- Added workflow-diff-examples.md with usage patterns
- Added transactional-updates-example.md showing before/after
- Updated README.md with v2.7.0 features
- Updated CLAUDE.md with latest changes

🤖 Generated with [Claude Code](https://claude.ai/code)

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

package-lock.json

@@ -1,15 +1,15 @@
 {
   "name": "n8n-mcp",
-  "version": "2.4.1",
+  "version": "2.7.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "n8n-mcp",
-      "version": "2.4.1",
+      "version": "2.7.0",
       "license": "MIT",
       "dependencies": {
-        "@modelcontextprotocol/sdk": "^1.12.1",
+        "@modelcontextprotocol/sdk": "^1.13.2",
         "@n8n/n8n-nodes-langchain": "^1.98.1",
         "axios": "^1.10.0",
         "better-sqlite3": "^11.10.0",
@@ -7094,9 +7094,9 @@
       }
     },
     "node_modules/@modelcontextprotocol/sdk": {
-      "version": "1.12.1",
-      "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.12.1.tgz",
-      "integrity": "sha512-KG1CZhZfWg+u8pxeM/mByJDScJSrjjxLc8fwQqbsS8xCjBmQfMNEBTotYdNanKekepnfRI85GtgQlctLFpcYPw==",
+      "version": "1.13.2",
+      "resolved": "https://registry.npmjs.org/@modelcontextprotocol/sdk/-/sdk-1.13.2.tgz",
+      "integrity": "sha512-Vx7qOcmoKkR3qhaQ9qf3GxiVKCEu+zfJddHv6x3dY/9P6+uIwJnmuAur5aB+4FDXf41rRrDnOEGkviX5oYZ67w==",
       "license": "MIT",
       "dependencies": {
         "ajv": "^6.12.6",