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.json

@@ -1,6 +1,6 @@
 {
   "name": "n8n-mcp",
-  "version": "2.6.3",
+  "version": "2.7.0",
   "description": "Integration between n8n workflow automation and Model Context Protocol (MCP)",
   "main": "dist/index.js",
   "scripts": {
@@ -34,6 +34,10 @@
     "test:n8n-manager": "node dist/scripts/test-n8n-manager-integration.js",
     "test:n8n-validate-workflow": "node dist/scripts/test-n8n-validate-workflow.js",
     "test:typeversion-validation": "node dist/scripts/test-typeversion-validation.js",
+    "test:workflow-diff": "node dist/scripts/test-workflow-diff.js",
+    "test:transactional-diff": "node dist/scripts/test-transactional-diff.js",
+    "test:mcp:update-partial": "node dist/scripts/test-mcp-n8n-update-partial.js",
+    "test:update-partial:debug": "node dist/scripts/test-update-partial-debug.js",
     "db:rebuild": "node dist/scripts/rebuild-database.js",
     "db:init": "node -e \"new (require('./dist/services/sqlite-storage-service').SQLiteStorageService)(); console.log('Database initialized')\"",
     "docs:rebuild": "ts-node src/scripts/rebuild-database.ts"
@@ -68,7 +72,7 @@
     "typescript": "^5.8.3"
   },
   "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",