fix: AI connection type propagation and get_node improvements (v2.28.1) (#461)

* fix: AI connection type propagation and get_node improvements (v2.28.1)

Bug fixes:
- Issue #458: addConnection now preserves AI connection types (ai_tool, ai_memory, ai_languageModel) instead of defaulting to 'main'
- Fixed false positive "AI Agent has no tools connected" validation warning

Enhancements:
- Added expectedFormat field to resourceLocator properties in get_node output
- Added versionNotice field to make typeVersion more prominent

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>

* test: add missing test coverage for PR #461 improvements

- Added test for AI Agent validation positive case (tools properly connected)
- Added 3 tests for expectedFormat on resourceLocator properties

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>

---------

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

tests/unit/services/workflow-validator-comprehensive.test.ts

@@ -1329,6 +1329,37 @@ describe('WorkflowValidator - Comprehensive Tests', () => {
       expect(result.warnings.some(w => w.message.includes('AI Agent has no tools connected'))).toBe(true);
     });
 
+    it('should NOT warn about AI agents WITH tools properly connected', async () => {
+      const workflow = {
+        nodes: [
+          {
+            id: '1',
+            name: 'Calculator Tool',
+            type: 'n8n-nodes-base.httpRequest',
+            position: [100, 100],
+            parameters: {}
+          },
+          {
+            id: '2',
+            name: 'Agent',
+            type: '@n8n/n8n-nodes-langchain.agent',
+            position: [300, 100],
+            parameters: {}
+          }
+        ],
+        connections: {
+          'Calculator Tool': {
+            ai_tool: [[{ node: 'Agent', type: 'ai_tool', index: 0 }]]
+          }
+        }
+      } as any;
+
+      const result = await validator.validateWorkflow(workflow as any);
+
+      // Should NOT have warning about missing tools
+      expect(result.warnings.some(w => w.message.includes('AI Agent has no tools connected'))).toBe(false);
+    });
+
     it('should suggest community package setting for AI tools', async () => {
       const workflow = {
         nodes: [