- Add inView() pure geometry helper to test if a craft's visual circle is at least partly within the camera's visible rect
- Gate enemy fire, auto-fire target selection, currentTarget lock, and bullet collision checks behind craftVisible() so off-screen hostiles hold lances, can't be engaged, and are immune to tracers until they fly into view
- Extend pickTarget() with an optional qualifies predicate to narrow the candidate pool (used for the on-screen rule)
- Document the rule in data/combat.json and CombatSystem class comments
