fix: resolve partial update validation/execution discrepancy (issue #45)

- Remove default settings logic from cleanWorkflowForUpdate that was causing
  "settings must NOT have additional properties" error
- The function now only removes read-only fields without adding any properties
- Add comprehensive test coverage in test-issue-45-fix.ts
- Add documentation explaining the difference between create and update functions
- Bump version to 2.7.14

This fixes the issue where n8n_update_partial_workflow would pass validation
but fail during execution when workflows didn't have settings defined.

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

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

docs/CHANGELOG.md

@@ -5,6 +5,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.7.14] - 2025-07-15
+
+### Fixed
+- **Partial Update Tool**: Fixed validation/execution discrepancy that caused "settings must NOT have additional properties" error (Issue #45)
+  - Removed logic in `cleanWorkflowForUpdate` that was incorrectly adding default settings to workflows
+  - The function now only removes read-only fields without adding any new properties
+  - This fixes the issue where partial updates would pass validation but fail during execution
+  - Added comprehensive test coverage in `test-issue-45-fix.ts`
+
 ## [2.7.13] - 2025-07-11
 
 ### Fixed