Added sanity check baseline made by claude.

Also changed the location to a panel in VIEW_3D instead of menu.

__init__.py

@@ -1,3 +1,19 @@
+import sys
+
+# Reload support: drop our cached submodules so "Reload Scripts" and
+# disable/enable pick up edits in every file, not only this one.
+for _name in [name for name in sys.modules if name.startswith(__name__ + ".")]:
+    del sys.modules[_name]
+
+import bpy  # noqa: E402
+from bpy.app.handlers import persistent  # noqa: E402
+
+from . import checks, core, tools_ops, ui  # noqa: E402
+from .core import runner  # noqa: E402
+
+api = core
+
+# Old bl_info to be able to develop on live code
 bl_info = {
     "name": "Melvile Tools",
     "author": "Walking The Dog (WTD)",
@@ -11,19 +27,32 @@ bl_info = {
     "category": [],
 }
 
-import bpy
 
-# Import modules
-from . import ops, ui
+@persistent
+def _on_load_post(*_args):
+    runner.clear()
+
+
+def _load_config_override():
+    prefs = ui.properties.get_prefs()
+    ui.properties.load_config_override(prefs.config_path if prefs else "")
 
 
 # Register modules
 def register() -> None:
-    ops.register()
+    tools_ops.register()
+    checks.load_all()
     ui.register()
+    _load_config_override()
+    bpy.app.handlers.load_post.append(_on_load_post)
 
 
 # Unregister modules
 def unregister() -> None:
-    ops.unregister()
+    tools_ops.unregister()
+    if _on_load_post in bpy.app.handlers.load_post:
+        bpy.app.handlers.load_post.remove(_on_load_post)
     ui.unregister()
+    runner.clear()
+    # The check registry is plain Python and is rebuilt with the modules on
+    # re-import, so it is kept as is (enable/disable without re-import).