feat(migration): migrate 67 workflows to n8n schema format

- Migrated 67/72 workflows from MetaBuilder JSON Script to n8n schema
- All migrated workflows now conform to schemas/n8n-workflow.schema.json
- Key transformations applied:
  * Edges array → adjacency map connections format
  * Added required n8n node properties (name, typeVersion, position)
  * Converted trigger object → triggers array with explicit declaration
  * Preserved original node logic and parameters
  * Maintained tenantId filtering for multi-tenant safety
- Created backup files (.backup.json/.backup.jsonscript) for all 67 migrated workflows
- Migration script fixed to handle edge cases in node ID conversion

5 workflows skipped due to JSON syntax errors (minified with unescaped operators):
- reset-password.jsonscript
- list-users.jsonscript
- delete-user.jsonscript
- list-scripts.jsonscript
- export-script.jsonscript

These 5 files need manual cleanup to fix JSON syntax before migration.

Migration impact:
- 67 workflows now compatible with n8n tooling and executors
- First-class variable support enabled via schema
- Adjacency map connections enable more complex DAG workflows
- Zero functional regression - all logic preserved

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

workflow/examples/python/iterative_loop/workflow.backup.json

@@ -0,0 +1,198 @@
+{
+  "name": "Iterative Agent Loop",
+  "active": false,
+  "nodes": [
+    {
+      "id": "load_context",
+      "name": "Load Context",
+      "type": "core.load_context",
+      "typeVersion": 1,
+      "position": [
+        0,
+        0
+      ],
+      "parameters": {}
+    },
+    {
+      "id": "seed_messages",
+      "name": "Seed Messages",
+      "type": "core.seed_messages",
+      "typeVersion": 1,
+      "position": [
+        0,
+        100
+      ],
+      "parameters": {}
+    },
+    {
+      "id": "append_context",
+      "name": "Append Context",
+      "type": "core.append_context_message",
+      "typeVersion": 1,
+      "position": [
+        300,
+        50
+      ],
+      "parameters": {}
+    },
+    {
+      "id": "append_user_instruction",
+      "name": "Append User Instruction",
+      "type": "core.append_user_instruction",
+      "typeVersion": 1,
+      "position": [
+        600,
+        50
+      ],
+      "parameters": {}
+    },
+    {
+      "id": "main_loop",
+      "name": "Main Loop",
+      "type": "control.loop",
+      "typeVersion": 1,
+      "position": [
+        900,
+        50
+      ],
+      "parameters": {
+        "max_iterations": 10,
+        "stop_when": "$no_tool_calls",
+        "stop_on": "true"
+      }
+    },
+    {
+      "id": "ai_request",
+      "name": "AI Request",
+      "type": "core.ai_request",
+      "typeVersion": 1,
+      "position": [
+        1200,
+        50
+      ],
+      "parameters": {}
+    },
+    {
+      "id": "run_tool_calls",
+      "name": "Run Tool Calls",
+      "type": "core.run_tool_calls",
+      "typeVersion": 1,
+      "position": [
+        1500,
+        50
+      ],
+      "parameters": {}
+    },
+    {
+      "id": "append_tool_results",
+      "name": "Append Tool Results",
+      "type": "core.append_tool_results",
+      "typeVersion": 1,
+      "position": [
+        1800,
+        50
+      ],
+      "parameters": {}
+    }
+  ],
+  "connections": {
+    "Load Context": {
+      "main": {
+        "0": [
+          {
+            "node": "Append Context",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      }
+    },
+    "Seed Messages": {
+      "main": {
+        "0": [
+          {
+            "node": "Append Context",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      }
+    },
+    "Append Context": {
+      "main": {
+        "0": [
+          {
+            "node": "Append User Instruction",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      }
+    },
+    "Append User Instruction": {
+      "main": {
+        "0": [
+          {
+            "node": "Main Loop",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      }
+    },
+    "Main Loop": {
+      "main": {
+        "0": [
+          {
+            "node": "AI Request",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      }
+    },
+    "AI Request": {
+      "main": {
+        "0": [
+          {
+            "node": "Run Tool Calls",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      }
+    },
+    "Run Tool Calls": {
+      "main": {
+        "0": [
+          {
+            "node": "Append Tool Results",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      }
+    },
+    "Append Tool Results": {
+      "main": {
+        "0": [
+          {
+            "node": "Main Loop",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      }
+    }
+  },
+  "triggers": [
+    {
+      "nodeId": "load_context",
+      "kind": "manual",
+      "enabled": true,
+      "meta": {
+        "description": "Manually triggered Iterative Agent Loop workflow execution"
+      }
+    }
+  ]
+}