Ship preload: a mod ship that fails to load or assemble is skipped, not fatal

PreloadAsync rethrew on the first failing hull, so one bad package faulted
Loading and no mod ship could spawn. Each hull now loads in its own try: a
failure destroys its partial visual, is logged with the hull's name, and the
rest still preload, as Compose skips a bad package. The play smoke installs the
package beside a broken sibling that composes but cannot assemble (its map icon
moved onto a meshless muzzle node) and proves the sibling has no prototype while
the good ship spawns.

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

Assets/Scripts/UI/MainMenu.cs

@@ -193,7 +193,7 @@ public class MainMenu : MonoBehaviour
     }
 
     // The one way into the game scene. Mod ship prototypes import asynchronously at boot, so the scene waits for them,
-    // and a failed import stops here with its reason rather than in the first zone.
+    // and a preload that could not run at all stops here with its reason rather than in the first zone.
     private void EnterGame() => StartCoroutine(EnterGameWhenModShipsAreReady());
 
     private IEnumerator EnterGameWhenModShipsAreReady()