perf: optimize workflow tool responses for token efficiency (v2.29.0) (#479)

* perf: optimize workflow tool responses for token efficiency (v2.29.0)

Reduce response sizes by 75-90% for 4 workflow management tools:

- n8n_update_partial_workflow: Returns {id, name, active, operationsApplied}
- n8n_create_workflow: Returns {id, name, active, nodeCount}
- n8n_update_full_workflow: Returns {id, name, active, nodeCount}
- n8n_delete_workflow: Returns {id, name, deleted: true}

AI agents can use n8n_get_workflow with mode 'structure' if they need
to verify the current workflow state after operations.

Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en

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

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

* fix: update tests and add nodeCount to partial update response

- Fix handleCreateWorkflow test to expect minimal response
- Fix handleDeleteWorkflow test to expect minimal response
- Add nodeCount to n8n_update_partial_workflow response for consistency
- Update documentation and CHANGELOG

Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en

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

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

* fix: update handlers-workflow-diff tests for minimal response

Update 3 more tests that expected full workflow in response:
- should apply diff operations successfully
- should activate workflow after successful update
- should deactivate workflow after successful update

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

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

* fix: update integration tests to use minimal response format

Integration tests now verify minimal response format and use
client.getWorkflow() to fetch actual workflow state for verification.

Conceived by Romuald Czlonkowski - www.aiadvisors.pl/en

* fix: update create/update workflow integration tests for minimal response

Integration tests now verify minimal response and use client.getWorkflow()
to fetch actual workflow state for detailed verification.

Conceived by Romuald Czlonkowski - www.aiadvisors.pl/en

* fix: add type assertions to fix TypeScript errors in tests

Conceived by Romuald Czlonkowski - www.aiadvisors.pl/en

---------

Co-authored-by: Romuald Członkowski <romualdczlonkowski@MacBook-Pro-Romuald.local>
Co-authored-by: Claude <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,31 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.29.0] - 2025-12-09
+
+### Performance
+
+**Token-Efficient Workflow Tool Responses (#479)**
+
+Optimized 4 workflow management tools to return minimal responses instead of full workflow objects, reducing token usage by 75-90%:
+
+- **n8n_update_partial_workflow**: Returns `{id, name, active, nodeCount, operationsApplied}` instead of full workflow
+- **n8n_create_workflow**: Returns `{id, name, active, nodeCount}` instead of full workflow
+- **n8n_update_full_workflow**: Returns `{id, name, active, nodeCount}` instead of full workflow
+- **n8n_delete_workflow**: Returns `{id, name, deleted: true}` instead of full deleted workflow
+
+**Impact**:
+- ~75-90% reduction in response token usage per operation
+- Messages now guide AI agents to use `n8n_get_workflow` with mode 'structure' if verification needed
+- No functional changes - full workflow data still available via `n8n_get_workflow`
+
+**Files Modified**:
+- `src/mcp/handlers-workflow-diff.ts` - Optimized partial update response
+- `src/mcp/handlers-n8n-manager.ts` - Optimized create, full update, and delete responses
+- `src/mcp/tool-docs/workflow_management/*.ts` - Updated documentation
+
+**Conceived by Romuald Członkowski - [AiAdvisors](https://www.aiadvisors.pl/en)**
+
 ## [2.28.9] - 2025-12-08
 
 ### Dependencies