feat: add Phase 1 core pathfinding architecture

Implements the new Baritone-inspired A* pathfinding system:
- Core types: PathNode, PathResult, MoveResult, MoveType, ActionCosts
- BinaryHeapOpenSet min-heap for A* open set
- AStarPathFinder with timeout, cancellation, partial path support
- CalculationContext for thread-safe world state snapshots
- MoveHelper for block passability checks
- IGoal interface + GoalBlock, GoalXZ, GoalNear, GoalComposite
- IMove interface + MoveTraverse, MoveDiagonal, MoveAscend, MoveDescend, MoveClimb
- /pathfind command for testing the new pathfinder

Made-with: Cursor

MinecraftClient/Resources/Translations/Translations.Designer.cs

@@ -4585,6 +4585,24 @@ namespace MinecraftClient {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Use new A* pathfinding to navigate to a location..
+        /// </summary>
+        internal static string cmd_pathfind_desc {
+            get {
+                return ResourceManager.GetString("cmd.pathfind.desc", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Pathfinding to ({0}, {1}, {2})....
+        /// </summary>
+        internal static string cmd_pathfind_started {
+            get {
+                return ResourceManager.GetString("cmd.pathfind.started", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to restart and reconnect to the server..
         /// </summary>

MinecraftClient/Resources/Translations/Translations.resx

@@ -1538,6 +1538,12 @@ You can use "/chunk status {0:0.0} {1:0.0} {2:0.0}" to check the chunk loading s
   <data name="cmd.move.walk" xml:space="preserve">
     <value>Walking from {1} to {0}</value>
   </data>
+  <data name="cmd.pathfind.desc" xml:space="preserve">
+    <value>Use new A* pathfinding to navigate to a location.</value>
+  </data>
+  <data name="cmd.pathfind.started" xml:space="preserve">
+    <value>Pathfinding to ({0}, {1}, {2})...</value>
+  </data>
   <data name="cmd.reco.desc" xml:space="preserve">
     <value>restart and reconnect to the server.</value>
   </data>