feat: enhance AI tool support and clarify documentation (v2.5.1)

- Update tool descriptions to clarify ANY node can be used as AI tool
- Add get_node_as_tool_info to available tools in README
- Enhance workflow validation tool descriptions for AI connections
- Update README with v2.5.1 release notes
- Remove redundant _General__Scrape_with_HTTP_tool.json file
- Bump version to 2.5.1 in package.json

The key insight: ANY n8n node can be connected to an AI Agent's tool
port, not just those marked with usableAsTool=true. This update makes
that clear throughout the documentation and tool descriptions.

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

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

docs/_General__Scrape_with_HTTP_tool.json

@@ -1,131 +0,0 @@
-{
-  "name": "[General] Scrape with HTTP tool",
-  "nodes": [
-    {
-      "parameters": {
-        "workflowInputs": {
-          "values": [
-            {
-              "name": "url"
-            }
-          ]
-        }
-      },
-      "type": "n8n-nodes-base.executeWorkflowTrigger",
-      "typeVersion": 1.1,
-      "position": [
-        0,
-        0
-      ],
-      "id": "5346cc19-24b6-4a35-aa97-8415f4bea3d6",
-      "name": "When Executed by Another Workflow"
-    },
-    {
-      "parameters": {
-        "url": "={{ $json.url }}",
-        "options": {}
-      },
-      "type": "n8n-nodes-base.httpRequest",
-      "typeVersion": 4.2,
-      "position": [
-        240,
-        0
-      ],
-      "id": "b0883f0f-a325-4d8f-9323-46ec5ac259f2",
-      "name": "HTTP Request3"
-    },
-    {
-      "parameters": {
-        "operation": "extractHtmlContent",
-        "extractionValues": {
-          "values": [
-            {
-              "cssSelector": "body",
-              "skipSelectors": "img"
-            }
-          ]
-        },
-        "options": {
-          "cleanUpText": true
-        }
-      },
-      "type": "n8n-nodes-base.html",
-      "typeVersion": 1.2,
-      "position": [
-        460,
-        0
-      ],
-      "id": "413d2e39-a958-44ad-b8bf-5b2ff473977f",
-      "name": "HTML"
-    }
-  ],
-  "pinData": {
-    "When Executed by Another Workflow": [
-      {
-        "json": {
-          "url": "https://www.onet.pl"
-        }
-      }
-    ]
-  },
-  "connections": {
-    "When Executed by Another Workflow": {
-      "main": [
-        [
-          {
-            "node": "HTTP Request3",
-            "type": "main",
-            "index": 0
-          }
-        ]
-      ]
-    },
-    "HTTP Request3": {
-      "main": [
-        [
-          {
-            "node": "HTML",
-            "type": "main",
-            "index": 0
-          }
-        ]
-      ]
-    },
-    "HTML": {
-      "main": [
-        []
-      ]
-    }
-  },
-  "active": false,
-  "settings": {
-    "executionOrder": "v1",
-    "saveDataSuccessExecution": "none",
-    "callerPolicy": "workflowsFromSameOwner"
-  },
-  "versionId": "e0f02ae3-2abc-4fa4-a201-dc9519d3b77f",
-  "meta": {
-    "instanceId": "f90d4c09665c36771f63f8fb50686f33a5a32ed6de3eadcceb02fed4e27faf46"
-  },
-  "id": "mu4NBMrRsGq4xAGs",
-  "tags": [
-    {
-      "createdAt": "2025-02-17T03:16:20.972Z",
-      "updatedAt": "2025-02-17T03:16:20.972Z",
-      "id": "kEJjx5SVonwfM7TL",
-      "name": "AI tool"
-    },
-    {
-      "createdAt": "2025-02-20T20:00:37.258Z",
-      "updatedAt": "2025-02-20T20:00:37.258Z",
-      "id": "iWK0KA4yRf7NGdav",
-      "name": "general"
-    },
-    {
-      "createdAt": "2025-02-20T21:14:11.867Z",
-      "updatedAt": "2025-02-20T21:14:11.867Z",
-      "id": "MmgG3evIY7x5HI86",
-      "name": "stage: production"
-    }
-  ]
-}