Implements a generic coroutine scheduler for Python generators that yield millisecond delays. Uses a `WakeMap` to track pending yields and a `run_frame` method to advance all ready coroutines, advancing Python generators via `__next__`. Decoupled from specific game logic; could be extracted into a standalone crate for any dual-language runtime that needs cooperative multitasking over Python generators.

Provides a Godot-inspired Signal class with `connect`, `disconnect`, and `emit` methods. Uses weak references to avoid memory leaks and supports one-shot connections via `connect_one_shot`. The implementation is minimal, self-contained, and generic enough to be reused in any Python project needing decoupled event communication. Demonstrates non-obvious skill in handling connection removal during emission and thread safety (though not explicitly claimed).

Central runtime that bridges Bevy ECS and Python script state. Manages spawning/despawning of dynamic subtrees (`spawn_dynamic_subtree`), processes `PythonCommand` enums (NodeAdd, NodeRemove, Broadcast, etc.), syncs physics back to Python objects, advances coroutines, and dispatches events. The use of a single GIL acquisition per frame (`python_frame_system`) with a `GILState` resource is a performant pattern. The module is tightly coupled to Scrawl's component types but the architecture of a command-driven bridge with batched processing is a reusable reference for any Rust-Python game engine.