fix: resolve 3 remaining bugs (checkPlayerFall, removeTrailBlocks, scoredBlocks)

src/main/java/dev/loki/loparkour/generator/lifecycle/loop/LifecycleEventManager.java

@@ -99,6 +99,8 @@ public class LifecycleEventManager {
             if (generator.state.playerSpawn != null) {
                 player.teleport(generator.state.playerSpawn);
             }
+            // Clear scored blocks so same coordinates can be re-scored after respawn
+            player.clearScoredBlocks();
         }
 
         // Reset generator state

src/main/java/dev/loki/loparkour/generator/lifecycle/loop/LifecycleTickManager.java

@@ -74,7 +74,7 @@ public class LifecycleTickManager {
         for (var player : generator.getPlayers()) {
             if (player.player.getLocation().getY() < fallThreshold) {
                 generator.fall();
-                break; // Only trigger once per tick
+                continue; // Don't break — keep checking remaining players
             }
         }
     }

src/main/java/dev/loki/loparkour/generator/lifecycle/player/GeneratorCleanup.java

@@ -88,8 +88,10 @@ public class GeneratorCleanup {
             }
         }
         
-        // Remove from history
-        generator.state.history.subList(startIndex, endIndex).clear();
+        // Remove from history (synchronized to prevent concurrent index shift)
+        synchronized (generator.state.history) {
+            generator.state.history.subList(startIndex, endIndex).clear();
+        }
     }
     
     /**

src/main/java/dev/loki/loparkour/player/core/ParkourPlayer.java

@@ -115,6 +115,13 @@ public class ParkourPlayer extends ParkourUser {
         save(LoParkour.getPlugin().isEnabled());
     }
 
+    /**
+     * Clear scored blocks set, typically on fall/respawn so same coordinates can be re-scored.
+     */
+    public void clearScoredBlocks() {
+        scoredBlocks.clear();
+    }
+
     private static String blockKey(Block block) {
         return block.getX() + "," + block.getY() + "," + block.getZ();
     }