Faction play 1: typed doctrine on Faction and one flight per faction per zone

FactionDoctrine/RoleDoctrine (Faction key 17), Flight as the only writer of
members' Target and Task, hail/grace/compliance, FollowTask/FollowState,
agent removal on Entities removal, doctrine-catalog command, FlightTests.
Not yet built or run; verification follows in later commits.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Assets/Scripts/ServerShared/Entity.cs

@@ -814,6 +814,9 @@ public abstract class Entity
         else _iffOverrides.Remove(other);
     }
 
+    // The override this entity holds on another, or null when it holds none (the derived rule decides).
+    public bool? IffOverride(Entity other) => _iffOverrides.TryGetValue(other, out var hostile) ? hostile : (bool?) null;
+
     public bool IsHostileTo(Entity other, bool recursive = false)
     {
         // An override decides only the stance of the entity that holds it. The recursive=true calls