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>

src/mcp/tools-n8n-manager.ts

@@ -276,34 +276,58 @@ export const n8nManagementTools: ToolDefinition[] = [
 
   // Execution Management Tools
   {
-    name: 'n8n_trigger_webhook_workflow',
-    description: `Trigger workflow via webhook. Must be ACTIVE with Webhook node. Method must match config.`,
+    name: 'n8n_test_workflow',
+    description: `Test/trigger workflow execution. Auto-detects trigger type (webhook/form/chat). Supports: webhook (HTTP), form (fields), chat (message). Note: Only workflows with these trigger types can be executed externally.`,
     inputSchema: {
       type: 'object',
       properties: {
-        webhookUrl: { 
-          type: 'string', 
-          description: 'Full webhook URL from n8n workflow (e.g., https://n8n.example.com/webhook/abc-def-ghi)' 
+        workflowId: {
+          type: 'string',
+          description: 'Workflow ID to execute (required)'
         },
-        httpMethod: { 
-          type: 'string', 
+        triggerType: {
+          type: 'string',
+          enum: ['webhook', 'form', 'chat'],
+          description: 'Trigger type. Auto-detected if not specified. Workflow must have a matching trigger node.'
+        },
+        // Webhook options
+        httpMethod: {
+          type: 'string',
           enum: ['GET', 'POST', 'PUT', 'DELETE'],
-          description: 'HTTP method (must match webhook configuration, often GET)' 
+          description: 'For webhook: HTTP method (default: from workflow config or POST)'
         },
-        data: { 
-          type: 'object', 
-          description: 'Data to send with the webhook request' 
+        webhookPath: {
+          type: 'string',
+          description: 'For webhook: override the webhook path'
         },
-        headers: { 
-          type: 'object', 
-          description: 'Additional HTTP headers' 
+        // Chat options
+        message: {
+          type: 'string',
+          description: 'For chat: message to send (required for chat triggers)'
         },
-        waitForResponse: { 
-          type: 'boolean', 
-          description: 'Wait for workflow completion (default: true)' 
+        sessionId: {
+          type: 'string',
+          description: 'For chat: session ID for conversation continuity'
+        },
+        // Common options
+        data: {
+          type: 'object',
+          description: 'Input data/payload for webhook, form fields, or execution data'
+        },
+        headers: {
+          type: 'object',
+          description: 'Custom HTTP headers'
+        },
+        timeout: {
+          type: 'number',
+          description: 'Timeout in ms (default: 120000)'
+        },
+        waitForResponse: {
+          type: 'boolean',
+          description: 'Wait for workflow completion (default: true)'
         }
       },
-      required: ['webhookUrl']
+      required: ['workflowId']
     }
   },
   {