RUDPClient/openspec/changes/archive/2026-03-26-main-thread-network-dispatch/tasks.md

1. Dispatcher Foundation

• 1.1 Add a MainThreadNetworkDispatcher in Assets/Scripts/Network/NetworkApplication/ that stores queued network work items in a thread-safe FIFO structure.
• 1.2 Define the dispatcher API needed by runtime code, including enqueueing from transport callbacks and draining from the Unity main thread.

2. Message Pipeline Refactor

• 2.1 Refactor MessageManager so ITransport.OnReceive parses envelopes and enqueues dispatch work instead of invoking registered handlers inline.
• 2.2 Preserve current handler registration and invalid-payload handling while moving actual handler execution into the dispatcher drain path.

3. Unity Runtime Integration

• 3.1 Integrate the dispatcher into Assets/Scripts/NetworkManager.cs so queued network messages are drained from the Unity frame loop.
• 3.2 Ensure transport-side responsibilities remain limited to receive, KCP processing, and enqueue/error handling, with Unity object mutation occurring only after main-thread drain.

4. Verification

• 4.1 Add or update edit mode tests to verify receive callbacks defer handler execution until an explicit drain step and preserve FIFO ordering.
• 4.2 Run the relevant network edit mode tests/build and update CodeX-TODO.md to reflect stage four progress once the implementation is complete.