identify_then_engage

Identify then engage: interceptors only on tracks confirmed to be strikers, and orphaned interceptors get retargeted rather than wasted.

Tests whether the identification range is worth the delay. Waiting until 150 u means firing later and with less flight time to spare, but never spending 4 credits on a 0.5 credit decoy. Against decoy_screen it should win the economy; against rush it gives up stand-off distance for nothing.