Faction.BossLoadout (key 22): the boss is its faction's Loadout, resolved by Loadouts.BossOf and built by Materialize

BossOf refuses typed (BossRefusal Unset or Missing, Describe names the field and echoes no input).
ZoneGenerator builds the boss from the Loadout with ChooseProduct as the chooser; a refused or
unbuildable boss logs and spawns none. Galaxy picks boss factions through BossOf; AetherDb factions
prints the boss Loadout. Loadout vocabulary: no preset, no variant. Production builds; the tests
project does not until the next commit (RunGoalTests still sets BossHull).

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

Assets/Scripts/ServerShared/LoadoutGenerator.cs

@@ -183,6 +183,8 @@ public class LoadoutGenerator
             count);
     }
 
+    // An item is on offer only through a product, so a design no product makes is never drawn, stocked or chosen; it reaches a ship
+    // only through a Loadout (ruling off-market-is-general).
     // The products this faction can be offered for a design kind (only gear needs a home), and whether manufacturer preference applies (it does
     // not once a required item has fallen back to any manufacturer). The one availability rule for every selection.
     private ((FactionProductData product, T design)[] available, bool preferManufacturers) AvailableProducts<T>(Predicate<T> filter, bool required) where T : CraftedItemData