fix: close 2022.3 compile gap in UnityFindObjectsCompat.FindAll (#1106)

The (Type, bool includeInactive) overload guarded its modern-API
branch with #elif UNITY_2023_1_OR_NEWER while the legacy reflection
helper LegacyFindObjectsOfType is gated by #if !UNITY_2022_3_OR_NEWER.
That left the entire Unity 2022.3.x band falling through to a
legacy helper that the preprocessor had already excluded, producing
CS0103: 'LegacyFindObjectsOfType' does not exist in the current
context (e.g. on 2022.3.62f2, see #1105).

The 3-arg FindObjectsByType(Type, FindObjectsInactive, FindObjectsSortMode)
overload has been available since Unity 2022.2, so 2022.3 can use the
modern API directly. Aligning the threshold with the rest of the file
(2022_3_OR_NEWER) closes the gap with no API loss.

Closes #1105

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dsarno

MCPForUnity/Runtime/Helpers/UnityFindObjectsCompat.cs

@@ -58,7 +58,7 @@ public static UObject[] FindAll(Type type, bool includeInactive)
 #if UNITY_6000_5_OR_NEWER
             return UObject.FindObjectsByType(type,
                 includeInactive ? UnityEngine.FindObjectsInactive.Include : UnityEngine.FindObjectsInactive.Exclude);
-#elif UNITY_2023_1_OR_NEWER
+#elif UNITY_2022_3_OR_NEWER
             return UObject.FindObjectsByType(type,
                 includeInactive ? UnityEngine.FindObjectsInactive.Include : UnityEngine.FindObjectsInactive.Exclude,
                 UnityEngine.FindObjectsSortMode.None);