feat: rename n8n_trigger_webhook_workflow to n8n_test_workflow with multi-trigger support (#460)

* feat: rename n8n_trigger_webhook_workflow to n8n_test_workflow with multi-trigger support

- Rename tool from n8n_trigger_webhook_workflow to n8n_test_workflow
- Add support for webhook, form, and chat triggers (auto-detection)
- Implement modular trigger system with registry pattern
- Add trigger detector for automatic trigger type inference
- Remove execute trigger type (n8n public API limitation)
- Add comprehensive tests for trigger detection and handlers

The tool now auto-detects trigger type from workflow structure and
supports all externally-triggerable workflows via n8n's public API.

Note: Direct workflow execution (Schedule/Manual triggers) requires
n8n's instance-level MCP access, not available via REST API.

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: add SSRF protection to webhook handler and update tests

- Add SSRF URL validation to webhook-handler.ts (critical security fix)
  Aligns with existing SSRF protection in form-handler.ts and chat-handler.ts
- Update parameter-validation.test.ts to use new n8n_test_workflow tool name

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

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

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

* feat: n8n_test_workflow unified trigger tool (v2.28.0)

Added new `n8n_test_workflow` tool replacing `n8n_trigger_webhook_workflow`:

Features:
- Auto-detects trigger type (webhook/form/chat) from workflow
- Supports multiple trigger types with type-specific parameters
- SSRF protection for all trigger handlers
- Extensible handler architecture with registry pattern

Changes:
- Fixed Zod schema to remove invalid 'execute' trigger type
- Updated README.md tool documentation
- Added CHANGELOG entry for v2.28.0
- Bumped version to 2.28.0

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

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

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

* test: add comprehensive unit tests for trigger handlers

Added 87 unit tests across 4 test files to improve code coverage:

- base-handler.test.ts (19 tests) - 100% coverage
- webhook-handler.test.ts (22 tests) - 100% coverage
- chat-handler.test.ts (23 tests) - 100% coverage
- form-handler.test.ts (23 tests) - 100% coverage

Tests cover:
- Input validation and parameter handling
- SSRF protection integration
- HTTP method handling and URL building
- Error response formatting
- Execution paths for all trigger types

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

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

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

---------

Co-authored-by: Claude <noreply@anthropic.com>

README.md

@@ -598,7 +598,7 @@ ALWAYS explicitly configure ALL parameters that control node behavior.
    - `n8n_create_workflow(workflow)` - Deploy
    - `n8n_validate_workflow({id})` - Post-deployment check
    - `n8n_update_partial_workflow({id, operations: [...]})` - Batch updates
-   - `n8n_trigger_webhook_workflow()` - Test webhooks
+   - `n8n_test_workflow({workflowId})` - Test workflow execution
 
 ## Critical Warnings
 
@@ -977,7 +977,10 @@ These tools require `N8N_API_URL` and `N8N_API_KEY` in your configuration.
 - **`n8n_deploy_template`** - Deploy templates from n8n.io directly to your instance with auto-fix
 
 #### Execution Management
-- **`n8n_trigger_webhook_workflow`** - Trigger workflows via webhook URL
+- **`n8n_test_workflow`** - Test/trigger workflow execution:
+  - Auto-detects trigger type (webhook, form, chat) from workflow
+  - Supports custom data, headers, and HTTP methods for webhooks
+  - Chat triggers support message and sessionId for conversations
 - **`n8n_executions`** - Unified execution management (v2.26.0):
   - `action: 'list'` - List executions with status filtering
   - `action: 'get'` - Get execution details by ID