When to use Signals?

Scenario	Use?	Reason
Player HP changes	✅	Critical logic; UI needs update; resilience required.
Network packet received	✅	Incoming thread needs to talk to Main Thread safely.
Button Click	✅	Decouples the UI from the logic.
Manager-to-Manager talk	✅	keeps systems loosely coupled.
Tight Loop Math	🚫	If strictly local, a direct method call is faster.