Remove arbitrary missile limits

A quirk about missiles is that they can be deflected, but only if an Animated Blockster hits them with a sword. This should be converted to an attribute (like Phantom or Invincible) that decides if the missile could be deflected or not.

Start by locating the missile deflection logic and the Animated Blockster sword-hit behavior, then compare them with the existing Phantom or Invincible attributes. The work is complete when missile deflection is controlled by an attribute rather than only by the Animated Blockster sword interaction.

Written by the indexing model from the issue text.