Your Godot 4 Area2D won't detect collisions and area_entered never fires. Here are the 6 real causes — monitoring flags, layers vs masks, missing shapes, and the overlap-on-activate trap — each with the fix.
You connected area_entered, you can see the two areas overlapping in the editor, and
nothing happens. This is the single most common Godot 4 combat bug, and it's almost
always one of these six things. Work down the list — they're ordered by how often
they're the culprit.
1. monitoring is off (or the wrong area is monitoring)
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