Several ai_info fields remember which order set them up (enemy_wing,
guard_objnum/signature/wingnum) or which mode a dynamic goal interrupted
(previous_mode, resume_goal_time), but nothing cleared them when a new
order took over. A ship that once guarded a wing would be yanked back
into AIM_GUARD whenever a wingmate died; a stale previous_mode of
AIM_GUARD could make a former guard abandon a counterattack; a stale
enemy_wing biased every find_enemy() toward a long-ago target; and a
resume_goal_time left over from a dynamic chase suppressed target
acquisition for up to 20 seconds into the next order.
Add ai_reset_order_state(), called when ai_process_mission_orders()
takes up a goal and when ai_do_default_behavior() runs. Each order's
own setup repopulates the fields it needs. enemy_wing is reset under
either $fix stale ai order state or $fix ai target recovery, since it
affects target selection; the rest only under the new flag.
maybe_set_dynamic_chase() wrote aip->mode into previous_submode, a
retail typo that left previous_mode untracked for dynamic chases. Under
the flag, save both fields properly, but not when a dynamic goal is
already in progress, so a nested interruption does not clobber the mode
to return to. Apply the same guard to the strafe/chase transitions in
aibig.cpp.
Co-Authored-By: Claude Fable 5.1 <[email protected]>
