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>

src/services/n8n-validation.ts

@@ -105,6 +105,13 @@ export function cleanWorkflowForUpdate(workflow: Workflow): Partial<Workflow> {
     // Remove fields that cause API errors
     pinData,
     tags,
+    // Remove additional fields that n8n API doesn't accept
+    isArchived,
+    usedCredentials,
+    sharedWithProjects,
+    triggerCount,
+    shared,
+    active,
     // Keep everything else
     ...cleanedWorkflow
   } = workflow as any;