Merge origin/master into mining: resolve five conflicts by owner, delete the belt-task machine

Mining owns belts, chunks and target picking; scenarios owns admission and run
staging; master owns ships and fire control (rule scenarios-cut.md S4).

- AetheriaStores.CatalogTypes: nine-type union, master's list plus FieldKindData, no Scenario.
- tools/AetherDb/Program.cs: both cases (ship-authoring, field-kinds), one usage string.
- Zone.cs: master's MineAsteroid dropped (mining deleted its inputs); scenarios' SettleBelts and its three calls deleted.
- RunStartTests: the two belt-task tests deleted (they read belt.Transforms and MineAsteroid).
- FireControlCut124Tests: master's strict Exact assertions; mining's CompatibleDrift allowance and its comment dropped.
- GameData/Aetheria.cc: master's pointer 70a7b0a9. This commit lacks the Asteroid field kind in the catalog, so
  TheShippedCatalogHasAPickableFieldKind fails here by design; the next commit rebuilds it.

Builds: this commit builds (verified at the end with commit 2); the catalog pin test fails at this commit.

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

Assets/Scripts/ServerShared/FireControl.cs

@@ -35,7 +35,7 @@ public static class FireControl
     // GameplaySettings.FiringArc. Zero on the hardpoint means "use the default," not "no arc."
     public static float ArcFor(EquippedItem item)
     {
-        var hardpoint = item.Entity.Hardpoints[item.Position.x, item.Position.y];
+        var hardpoint = item.Hardpoint;
         var arc = hardpoint?.FiringArc ?? 0f;
         return arc > 0 ? arc : item.ItemManager.GameplaySettings.FiringArc;
     }