fix: pet release never finished, summon master follows the pet, horse breeder and notoriety guards (#2613)

Pet and summon bugs found by the master-reference audit for #2592 (comments there have the full inventory). Independent of delta saves.

## Releasing a pet never finished

The Release order ran two half-releases that never met:

- The order handler cleared the master. That set `Controlled` to false, so `Obey` never ran again and the think-side `DoOrderRelease` (re-home, three-day delete timer, backpack drop) was dead code: a released pet kept its pack and never despawned.
- The loyalty drain called `DoOrderRelease` directly, so a pet whose loyalty hit zero got the countdown and dropped its pack but kept its master and its owner's follower slots, the opposite of the code comment's intent.

`DoOrderRelease` is now the whole release (targets, bonding, `SetControlMaster(null)`, re-home, delete or countdown, pack drop) and runs once, synchronously, from the handler or the loyalty drain. Summons still die on release, as before. Two tests pin both entry points: master cleared, follower slots returned, countdown running, home anchored.

This is the one place the `PetOrders` / `PetOrderHandlers` split bit; the wider audit of that duplication is a separate task.

## Summon master follows the pet

Transfer, stable claim, GM "obey" and Ball of Summoning copied `SummonMaster` only when `Summoned`, so a talisman summon (`Summoned` is false, `SummonMaster` set) kept its original summoner after a transfer: two different masters on one creature, with the original summoner's area spells still exempting it. They now mirror the summon master whenever it is set. Jail stabling cleared only `ControlMaster`, so a jailed talisman summon kept charging the summoner's follower slots; it now clears both, like the stable master and auto-stable already do.

## Small ones

- The faction horse breeder set `Controlled`/`ControlMaster` directly; it now goes through `SetControlMaster` and tells the buyer why it refused (1049607) instead of silently deleting the horse.
- `Notoriety` dereferenced `SummonMaster` on a summoned creature without a null check.

## Tests

UOContent.Tests 778 green (two new).

Projects/UOContent/Engines/Factions/Gumps/HorseBreederGump.cs

@@ -61,7 +61,7 @@ public class HorseBreederGump : FactionGump
 
         if (m_From.Followers + horse.ControlSlots > m_From.FollowersMax)
         {
-            // TODO: Message?
+            m_From.SendLocalizedMessage(1049607); // You have too many followers to control that creature.
             horse.Delete();
         }
         else
@@ -79,9 +79,7 @@ public class HorseBreederGump : FactionGump
             else if (pack.ConsumeTotal(typeof(Silver), FactionWarHorse.SilverPrice) &&
                      pack.ConsumeTotal(typeof(Gold), FactionWarHorse.GoldPrice))
             {
-                horse.Controlled = true;
-                horse.ControlMaster = m_From;
-
+                horse.SetControlMaster(m_From);
                 horse.ControlOrder = OrderType.Follow;
                 horse.ControlTarget = m_From;