feat: Change EntityCollection.remove() to accept Entity objects

Previously, EntityCollection.remove() required an integer index, which was
inconsistent with Python's list.remove(item) behavior and the broader
Python ecosystem conventions.

Changes:
- remove() now accepts Entity object directly instead of index
- Searches collection by comparing C++ shared_ptr identity
- Raises ValueError if entity not found in collection
- More Pythonic API matching Python's list.remove() semantics

This aligns with Issue #73 and improves API consistency across the
collection system.

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

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

src/UIGrid.cpp

@@ -1772,33 +1772,46 @@ PyObject* UIEntityCollection::append(PyUIEntityCollectionObject* self, PyObject*
 
 PyObject* UIEntityCollection::remove(PyUIEntityCollectionObject* self, PyObject* o)
 {
-    if (!PyLong_Check(o))
+    // Type checking - must be an Entity
+    if (!PyObject_IsInstance(o, PyObject_GetAttrString(McRFPy_API::mcrf_module, "Entity")))
     {
-        PyErr_SetString(PyExc_TypeError, "EntityCollection.remove requires an integer index to remove");
+        PyErr_SetString(PyExc_TypeError, "EntityCollection.remove requires an Entity object");
-        return NULL;
-    }
-    long index = PyLong_AsLong(o);
-    
-    // Handle negative indexing
-    while (index < 0) index += self->data->size();
-    
-    if (index >= self->data->size())
-    {
-        PyErr_SetString(PyExc_ValueError, "Index out of range");
         return NULL;
     }
     
-    // Get iterator to the entity to remove
+    // Get the C++ object from the Python object
-    auto it = self->data->begin();
+    PyUIEntityObject* entity = (PyUIEntityObject*)o;
-    std::advance(it, index);
+    if (!entity->data) {
+        PyErr_SetString(PyExc_RuntimeError, "Invalid Entity object");
+        return NULL;
+    }
     
-    // Clear grid reference before removing
+    // Get the underlying list
+    auto list = self->data.get();
+    if (!list) {
+        PyErr_SetString(PyExc_RuntimeError, "The collection store returned a null pointer");
+        return NULL;
+    }
+    
+    // Search for the entity by comparing C++ pointers
+    auto it = list->begin();
+    while (it != list->end()) {
+        if (it->get() == entity->data.get()) {
+            // Found it - clear grid reference before removing
             (*it)->grid = nullptr;
             
-    // release the shared pointer at correct part of the list
+            // Remove from the list
             self->data->erase(it);
+            
             Py_INCREF(Py_None);
             return Py_None;
+        }
+        ++it;
+    }
+    
+    // Entity not found - raise ValueError
+    PyErr_SetString(PyExc_ValueError, "Entity not in EntityCollection");
+    return NULL;
 }
 
 PyObject* UIEntityCollection::extend(PyUIEntityCollectionObject* self, PyObject* o)