fix(scenario): combat-focus-fire-priority — recalibrate after engine movement fixes

fix(scenario): combat-focus-fire-priority — recalibrate after engine balance fixes

tests: module-level importorskip on all 80 engine-dependent test files

fix(scenario): combat-focus-fire-priority — tighten medium discrimination (zero attrition cap, 8 e1 + 3 e3 shield/rear formation)

feat(scenario): combat-focus-fire-priority — focus-fire highest-DPS first (SC2 focus-fire / MicroRTS anchor)