feat: add n8n_generate_workflow tool for hosted workflow generation

Add new MCP tool that enables AI-powered workflow generation from natural
language descriptions. Uses handler delegation pattern — hosting environments
inject a GenerateWorkflowHandler via EngineOptions, self-hosted instances
receive a hosted-only informational response.

Handler flows through N8NMCPEngine → SingleSessionHTTPServer →
N8NDocumentationMCPServer with helpers for createWorkflow, validateWorkflow,
autofixWorkflow, and getWorkflow.

Includes full tool documentation, tests, and corrected tools overview count.

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

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

dist/mcp/server.d.ts

@@ -1,5 +1,9 @@
 import { InstanceContext } from '../types/instance-context';
+import { GenerateWorkflowHandler } from '../types/generate-workflow';
 import { EarlyErrorLogger } from '../telemetry/early-error-logger';
+interface MCPServerOptions {
+    generateWorkflowHandler?: GenerateWorkflowHandler;
+}
 export declare class N8NDocumentationMCPServer {
     private server;
     private db;
@@ -16,7 +20,8 @@ export declare class N8NDocumentationMCPServer {
     private useSharedDatabase;
     private sharedDbState;
     private isShutdown;
-    constructor(instanceContext?: InstanceContext, earlyLogger?: EarlyErrorLogger);
+    private generateWorkflowHandler?;
+    constructor(instanceContext?: InstanceContext, earlyLogger?: EarlyErrorLogger, options?: MCPServerOptions);
     close(): Promise<void>;
     private initializeDatabase;
     private initializeInMemorySchema;
@@ -46,6 +51,7 @@ export declare class N8NDocumentationMCPServer {
     private getNodeDocumentation;
     private safeJsonParse;
     private getDatabaseStatistics;
+    private buildOperationsTree;
     private getNodeEssentials;
     private getNode;
     private handleInfoMode;
@@ -74,6 +80,8 @@ export declare class N8NDocumentationMCPServer {
     private listNodeTemplates;
     private getTemplate;
     private searchTemplates;
+    private workflowPatternsCache;
+    private getWorkflowPatterns;
     private getTemplatesForTask;
     private searchTemplatesByMetadata;
     private getTaskDescription;
@@ -83,4 +91,5 @@ export declare class N8NDocumentationMCPServer {
     run(): Promise<void>;
     shutdown(): Promise<void>;
 }
+export {};
 //# sourceMappingURL=server.d.ts.map