refactor(workflow): convert all plugins to class/struct + factory pattern

- Python: class extending NodeExecutor + factory.py (80+ plugins)
- TypeScript: class implements NodeExecutor + factory.ts (7 groups, 116 classes)
- Go: struct with methods + factory.go (36 plugins)
- Rust: struct impl NodeExecutor trait + factory.rs (54 plugins)
- Mojo: struct + factory.mojo (11 plugins)

All package.json files now include:
- files array listing source files
- metadata.class/struct field
- metadata.entrypoint field

This enables a unified plugin loading system across all languages
with no import side effects (Spring-style DI pattern).

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

workflow/plugins/python/tools/tools_create_pull_request/factory.py

@@ -0,0 +1,8 @@
+"""Factory for ToolsCreatePullRequest plugin."""
+
+from .tools_create_pull_request import ToolsCreatePullRequest
+
+
+def create():
+    """Create and return a ToolsCreatePullRequest instance."""
+    return ToolsCreatePullRequest()

workflow/plugins/python/tools/tools_create_pull_request/package.json

@@ -1,13 +1,16 @@
 {
   "name": "@metabuilder/tools_create_pull_request",
   "version": "1.0.0",
-  "description": "tools_create_pull_request plugin",
+  "description": "Create a pull request with title, body, and branch information",
   "author": "MetaBuilder",
   "license": "MIT",
   "keywords": ["tools", "workflow", "plugin"],
   "main": "tools_create_pull_request.py",
+  "files": ["tools_create_pull_request.py", "factory.py"],
   "metadata": {
     "plugin_type": "tools.create_pull_request",
-    "category": "tools"
+    "category": "tools",
+    "class": "ToolsCreatePullRequest",
+    "entrypoint": "execute"
   }
 }

workflow/plugins/python/tools/tools_create_pull_request/tools_create_pull_request.py

@@ -1,13 +1,22 @@
 """Workflow plugin: create pull request."""
 
+from ...base import NodeExecutor
 
-def run(runtime, inputs):
+
+class ToolsCreatePullRequest(NodeExecutor):
     """Create a pull request via tool runner."""
-    result = runtime.tool_runner.call(
-        "create_pull_request",
-        title=inputs.get("title"),
-        body=inputs.get("body"),
-        head_branch=inputs.get("head_branch"),
-        base_branch=inputs.get("base_branch", "main")
-    )
-    return {"result": result}
+
+    node_type = "tools.create_pull_request"
+    category = "tools"
+    description = "Create a pull request with title, body, and branch information"
+
+    def execute(self, inputs, runtime=None):
+        """Create a pull request via tool runner."""
+        result = runtime.tool_runner.call(
+            "create_pull_request",
+            title=inputs.get("title"),
+            body=inputs.get("body"),
+            head_branch=inputs.get("head_branch"),
+            base_branch=inputs.get("base_branch", "main")
+        )
+        return {"result": result}