Destroy pre-match objects on seek and block hunter wall-climb while hiding

Destroy every GameObject tagged "PreMatch" locally when the match enters
the Seek sub-phase (hooked in ApplyPhaseLocal, runs on every machine; the
objects are plain scene geometry with no NetworkObject, so each client
cleans up its own copies). Block hunters from starting a wall- or
ceiling-climb during the Hide sub-phase via a WallClimbBlockedNow() gate
in UpdateWallClimbState; an in-progress climb is exited cleanly.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scripts/MatchManager.cs

@@ -162,6 +162,8 @@ public class MatchManager : MonoBehaviour
     private float _phaseDuration;
     private MatchMode _localMode = MatchMode.Classic; // mirror of the server's matchMode, carried in the phase message
 
+    private const string PreMatchTag = "PreMatch"; // scene props destroyed when seek starts
+
     /// <summary>True while a match sub-phase (Hide/Seek/Resolution) is running on this machine.</summary>
     public bool MatchActive => _subPhase != MatchSubPhase.None;
     /// <summary>This machine's current sub-phase (mirror of the server's broadcast).</summary>
@@ -566,7 +568,23 @@ public class MatchManager : MonoBehaviour
         _phaseDuration = duration;
         _phaseEndTime = Time.time + duration;
         _localMode = mode;
-        if (changed) SubPhaseChanged?.Invoke(phase);
+        if (changed)
+        {
+            SubPhaseChanged?.Invoke(phase);
+            // Props staged only for the hide phase are gone the instant seek begins.
+            if (phase == MatchSubPhase.Seek) DestroyPreMatchObjects();
+        }
+    }
+
+    // Scene props tagged "PreMatch" exist only while players hide; the moment seek starts they must be gone
+    // on every machine. ApplyPhaseLocal runs on all of them (server directly, clients via the phase message),
+    // so each destroys its own local copies -- these are plain scene geometry, not NetworkObjects, so there
+    // is nothing to replicate.
+    private static void DestroyPreMatchObjects()
+    {
+        var props = GameObject.FindGameObjectsWithTag(PreMatchTag);
+        for (int i = 0; i < props.Length; i++)
+            Destroy(props[i]);
     }
 
     // Sends a sub-phase (byte) + its remaining duration (float) + the match mode (byte) to one client, or to