Hygiene B6b: convert leaky-world tests + HudSystem cosmetics

- 10 EditMode files: every bare trailing world.Dispose() now inside using(world){} (single-world) or a [TearDown]+List<World> (the multi-world reject-matrix tests in BoonApplyTests/RouteSelectSystemTests) — an assertion failure can no longer leak the World and mask the true first failure. No test logic changed.
- HudSystem: collapse the blank-line run before the class close; trim the extracted route-map clause from the READY-panel comment.

466/466 EditMode tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/_Project/Scripts/Client/Presentation/HudSystem.cs

@@ -72,9 +72,7 @@ namespace ProjectM.Client
         // END-2: terminal win/loss banner (observes the replicated RunOutcome; latched server-side).
         VisualElement _runBanner;
         Label _runBannerText, _runBannerSub;
-        // Demo polish: the clickable READY panel (Staging/Launching) + the drawn branching route map
-        // (RouteSelect) — the map is regenerated client-side from RunInfo.RunSeed for DISPLAY only; the
-        // clickable next-layer nodes bind to the authoritative RouteOpt* bytes (never the regen).
+        // Demo polish: the clickable READY panel (Staging/Launching).
         VisualElement _readyPanel, _readyPipRow;
         Button _readyBtn;
         Label _readyTitle;
@@ -1566,23 +1564,5 @@ namespace ProjectM.Client
         bool _wentInRun;
         float _runFailedUntil;
 
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     }
 }