refactor: rewrite all MCP tool documentation for AI agent optimization

- Redesigned documentation to be utilitarian and AI-agent focused
- Removed all pleasantries, emojis, and conversational language
- Added concrete numbers throughout (528 nodes, 108 triggers, 264 AI tools)
- Updated all tool descriptions with practical, actionable information
- Enhanced examples with actual return structures and usage patterns
- Made Code node guides prominently featured in overview
- Verified documentation accuracy through extensive testing
- Standardized format across all 30+ tool documentation files

Documentation now optimized for token efficiency while maintaining
clarity and completeness for AI agent consumption.

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

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

src/mcp/tool-docs/index.ts

@@ -31,7 +31,6 @@ import {
   n8nHealthCheckDoc,
   n8nListAvailableToolsDoc
 } from './system';
-import { codeNodeGuideDoc } from './special';
 import {
   n8nCreateWorkflowDoc,
   n8nGetWorkflowDoc,
@@ -57,9 +56,6 @@ export const toolsDocumentation: Record<string, ToolDocumentation> = {
   n8n_health_check: n8nHealthCheckDoc,
   n8n_list_available_tools: n8nListAvailableToolsDoc,
   
-  // Special tools
-  code_node_guide: codeNodeGuideDoc,
-  
   // Discovery tools
   search_nodes: searchNodesDoc,
   list_nodes: listNodesDoc,