[DHAKED440]

Fixes issue #732.

Problem

MEGNetConv wrapped its edge and node update layers in StatefulLuxLayer, but returned the original state unchanged. Updates from stateful sublayers such as BatchNorm were therefore lost between calls.

Solution

Return the updated states from both the edge update layer (ϕe) and node update layer (ϕv) after the MEGNet forward pass.

Changes Made

• Updated the MEGNetConv forward method to return both sublayers’ updated states.
• Added a regression test using BatchNorm in ϕe, including reuse of the returned state.
• Updated the GNNLux development version and changelog.

Testing

• Reproduced the issue before the fix.
• Ran the MEGNetConv convolution test item.
• Ran the GNNLux CPU test suite.

Test results: The focused runner completed with 227 passes and 2 broken/skipped tests. The full GNNLux CPU runner completed with 183 passes and 2 broken/skipped tests; both exited with code 0. The runs logged sandbox-related Revise path permission errors. Pkg.test() was blocked by a registry archive permission error, so I ran the package test runner directly.