feat(tools): rename start_here to tools_documentation with depth control (v2.7.4)

- Renamed start_here_workflow_guide to tools_documentation for clarity
- Added depth parameter to control documentation detail (essentials/full)
- Converted output from JSON to LLM-friendly plain text format
- Added per-tool documentation capability
- Created two-tier documentation system:
  - Essentials: brief info with key parameters and tips
  - Full: comprehensive docs with examples and best practices
- Documented 8 commonly used MCP tools
- Removed 380+ lines of unused getWorkflowGuide method
- Fixed duplicate tool definitions
- Updated all documentation references
- Added test script for tools documentation

BREAKING CHANGE: start_here_workflow_guide renamed to tools_documentation

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

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

scripts/test-tools-documentation.ts

@@ -0,0 +1,57 @@
+import { N8NDocumentationMCPServer } from '../src/mcp/server';
+import path from 'path';
+
+async function testToolsDocumentation() {
+  const dbPath = path.join(__dirname, '..', 'nodes.db');
+  const server = new N8NDocumentationMCPServer(dbPath);
+  
+  console.log('=== Testing tools_documentation tool ===\n');
+  
+  // Test 1: No parameters (quick reference)
+  console.log('1. Testing without parameters (quick reference):');
+  console.log('----------------------------------------');
+  const quickRef = await server.executeTool('tools_documentation', {});
+  console.log(quickRef);
+  console.log('\n');
+  
+  // Test 2: Overview with essentials depth
+  console.log('2. Testing overview with essentials:');
+  console.log('----------------------------------------');
+  const overviewEssentials = await server.executeTool('tools_documentation', { topic: 'overview' });
+  console.log(overviewEssentials);
+  console.log('\n');
+  
+  // Test 3: Overview with full depth
+  console.log('3. Testing overview with full depth:');
+  console.log('----------------------------------------');
+  const overviewFull = await server.executeTool('tools_documentation', { topic: 'overview', depth: 'full' });
+  console.log(overviewFull.substring(0, 500) + '...\n');
+  
+  // Test 4: Specific tool with essentials
+  console.log('4. Testing search_nodes with essentials:');
+  console.log('----------------------------------------');
+  const searchNodesEssentials = await server.executeTool('tools_documentation', { topic: 'search_nodes' });
+  console.log(searchNodesEssentials);
+  console.log('\n');
+  
+  // Test 5: Specific tool with full documentation
+  console.log('5. Testing search_nodes with full depth:');
+  console.log('----------------------------------------');
+  const searchNodesFull = await server.executeTool('tools_documentation', { topic: 'search_nodes', depth: 'full' });
+  console.log(searchNodesFull.substring(0, 800) + '...\n');
+  
+  // Test 6: Non-existent tool
+  console.log('6. Testing non-existent tool:');
+  console.log('----------------------------------------');
+  const nonExistent = await server.executeTool('tools_documentation', { topic: 'fake_tool' });
+  console.log(nonExistent);
+  console.log('\n');
+  
+  // Test 7: Another tool example
+  console.log('7. Testing n8n_update_partial_workflow with essentials:');
+  console.log('----------------------------------------');
+  const updatePartial = await server.executeTool('tools_documentation', { topic: 'n8n_update_partial_workflow' });
+  console.log(updatePartial);
+}
+
+testToolsDocumentation().catch(console.error);