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/utils/utils_update_roadmap/factory.py

@@ -0,0 +1,7 @@
+"""Factory for UpdateRoadmap plugin."""
+
+from .utils_update_roadmap import UpdateRoadmap
+
+
+def create():
+    return UpdateRoadmap()

workflow/plugins/python/utils/utils_update_roadmap/package.json

@@ -1,13 +1,16 @@
 {
   "name": "@metabuilder/utils_update_roadmap",
   "version": "1.0.0",
-  "description": "utils_update_roadmap plugin",
+  "description": "Update ROADMAP.md with new content",
   "author": "MetaBuilder",
   "license": "MIT",
   "keywords": ["utils", "workflow", "plugin"],
   "main": "utils_update_roadmap.py",
+  "files": ["utils_update_roadmap.py", "factory.py"],
   "metadata": {
     "plugin_type": "utils.update_roadmap",
-    "category": "utils"
+    "category": "utils",
+    "class": "UpdateRoadmap",
+    "entrypoint": "execute"
   }
 }

workflow/plugins/python/utils/utils_update_roadmap/utils_update_roadmap.py

@@ -1,21 +1,30 @@
 """Workflow plugin: update roadmap file."""
+
 import logging
 
+from ...base import NodeExecutor
+
 logger = logging.getLogger("metabuilder")
 
 
-def _update_roadmap(content: str):
+class UpdateRoadmap(NodeExecutor):
     """Update ROADMAP.md with new content."""
-    with open("ROADMAP.md", "w", encoding="utf-8") as f:
-        f.write(content)
-    logger.info("ROADMAP.md updated successfully.")
 
+    node_type = "utils.update_roadmap"
+    category = "utils"
+    description = "Update ROADMAP.md with new content"
 
-def run(_runtime, inputs):
-    """Update ROADMAP.md with new content."""
-    content = inputs.get("content")
-    if not content:
-        return {"error": "Content is required"}
+    def execute(self, inputs, runtime=None):
+        """Update ROADMAP.md with new content."""
+        content = inputs.get("content")
+        if not content:
+            return {"error": "Content is required"}
 
-    _update_roadmap(content)
-    return {"result": "ROADMAP.md updated successfully"}
+        self._update_roadmap(content)
+        return {"result": "ROADMAP.md updated successfully"}
+
+    def _update_roadmap(self, content: str):
+        """Update ROADMAP.md with new content."""
+        with open("ROADMAP.md", "w", encoding="utf-8") as f:
+            f.write(content)
+        logger.info("ROADMAP.md updated successfully.")