Homing Missiles [IA]

Homing Missiles 3.2.1
Fixes
Fixed an integer overflow that prevented in-flight countermeasure scanning from ever starting.
Each decoy in a burst now gets an independent, stable diversion threshold. Decoys are reconsidered as position and timing improve, without endlessly rerolling unchanged geometry.
Enforced decoy visibility and spherical effective range. Wrong-type and obstructed decoys cannot distract a seeker.
Enabled chaff against the current entity/player seeker profiles; flares remain specific to aircraft seekers.
Separated client/server weapon selection, fire-mode selection and threat caches, preventing matching entity IDs from contaminating authoritative state in an integrated server.
Made target-cycle requests one-shot, cleared expired obscured tracks, and prevented an old target's launch authorization from transferring to a replacement.
Kept line-of-sight sample points inside living targets' and decoys' hitboxes, including crouching players; missile visibility checks originate at the missile, and nested aircraft passengers are recognized consistently.
Prevented guided launch without a current, visible lock; no ammunition is spent on rejected attempts.
Rejected empty/stale client snapshots instead of displaying a phantom locked state.