fix(map): stop MapRepo.get/2 masking all errors as :not_found

MapRepo.get/2 flattened every error from Api.Map.by_id/1 into
{:error, :not_found}. That turned infrastructure faults into a
"map does not exist" signal: a DBConnection.OwnershipError in test
surfaced as "Failed to load map state" -> "map not loaded" ->
"Timeout waiting for map ... Check Map.Manager is running", pointing
at Map.Manager (which was running fine) instead of the real cause.

Keep the :not_found translation for a genuine Ash NotFound, and
propagate + log anything else.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

lib/wanderer_app/repositories/map_repo.ex

@@ -21,8 +21,15 @@ defmodule WandererApp.MapRepo do
       {:ok, map} ->
         map |> load_relationships(relationships)
 
-      _ ->
+      {:error, %Ash.Error.Query.NotFound{}} ->
         {:error, :not_found}
+
+      {:error, reason} = error ->
+        # Previously every error was flattened into {:error, :not_found}, which
+        # masked infrastructure faults (e.g. DBConnection ownership errors) as
+        # "map does not exist" and made them very hard to diagnose.
+        Logger.error("MapRepo.get failed for map #{inspect(map_id)}: #{inspect(reason)}")
+        error
     end
   end