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<p>Reports GDScript signals that are never used in code or referenced from Godot scenes/resources, and suggests removing them.</p>
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<p>Notes:</p>
<ul>
  <li>Only user-defined signals declared with the <code>signal</code> keyword are checked.</li>
  <li>Usages include connecting to or emitting the signal in code.</li>
  <li>References from .tscn/.tres files are taken into account.</li>
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