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feat(enemy): 追击(nav)也夹紧悬崖边缘——碰撞体前缘不越地形边缘

MoveWithSpeed(导航跟段驱动追击)原先无边缘夹紧，仅靠 nav 图，agent 按点定位
可让碰撞体前缘越出段/地形边缘约半个碰撞体宽。现加"悬崖"夹紧(WouldFallAhead，
按碰撞体前缘即时判定)，贴地生效：追击时碰撞体边缘停在地形边缘、不越界，与 Pace
一致。只夹悬崖不夹墙(墙交寻路绕行，免误夹停)；跨沟的 nav-link 跳/落不经
MoveWithSpeed(仅 IsMovingOnSegment 时写速度)，故不影响跳跃/下落过沟。

WouldBlockAhead 拆为 WouldHitWallAhead / WouldFallAhead 复用；PlayMode 校验
拆分正确(前缘朝悬崖侧 WouldFall=True)、Pace 不回归。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Assets/_Game/Scripts/Enemies/EnemyMovement.cs

@@ -226,33 +226,39 @@ namespace BaseGames.Enemies
             return new Vector2(x, b.min.y);
         }
 
+        private Collider2D GroundColliderOrSelf()
+            => _groundCheckCollider != null ? _groundCheckCollider : GetComponent<Collider2D>();
+
         /// <summary>
-        /// 朝 <paramref name="dir"/> 前进是否会撞墙或让碰撞体前缘越过地形边缘。
+        /// 朝 <paramref name="dir"/> 前进是否会撞墙或让碰撞体前缘越过地形边缘（墙 或 悬崖）。
         /// 用碰撞体前缘（bounds.max.x / min.x）判定，天然考虑碰撞体宽度——
         /// 保证"碰撞体边缘不越过地形边缘"。用当前请求方向即时射线，避免缓存朝向过期。
         /// 供移动层夹紧与巡逻 Pace 翻向共用同一判定，避免"夹停了却不掉头"。
         /// </summary>
-        public bool WouldBlockAhead(float dir)
+        public bool WouldBlockAhead(float dir) => WouldHitWallAhead(dir) || WouldFallAhead(dir);
+
+        /// <summary>朝 <paramref name="dir"/> 前缘水平方向是否有墙。</summary>
+        public bool WouldHitWallAhead(float dir)
         {
-            var col = _groundCheckCollider != null ? _groundCheckCollider : GetComponent<Collider2D>();
+            var col = GroundColliderOrSelf();
-            if (col == null) return false;
+            if (col == null || _wallCheckDist <= 0f) return false;
             Bounds b = col.bounds;
             float sign  = Mathf.Sign(dir);
-            float edgeX = sign >= 0f ? b.max.x : b.min.x;      // 朝向侧碰撞体前缘
+            float edgeX = sign >= 0f ? b.max.x : b.min.x;
             LayerMask wallLayer = (_wallMask.value != 0) ? _wallMask : _groundMask;
+            return Physics2D.Raycast(new Vector2(edgeX, b.center.y), new Vector2(sign, 0f), _wallCheckDist, wallLayer);
+        }
 
-            // 墙：从前缘水平探；命中则前方有墙
+        /// <summary>朝 <paramref name="dir"/> 前缘外是否为悬崖（脚边地面缺失，会让碰撞体越出地形边缘）。</summary>
-            if (_wallCheckDist > 0f &&
+        public bool WouldFallAhead(float dir)
-                Physics2D.Raycast(new Vector2(edgeX, b.center.y), new Vector2(sign, 0f), _wallCheckDist, wallLayer))
+        {
-                return true;
+            var col = GroundColliderOrSelf();
-
+            if (col == null || _ledgeCheckDownDist <= 0f) return false;
-            // 悬崖：从"前缘 + 前探偏移"处向下探地；无地面则前缘外是悬崖
+            Bounds b = col.bounds;
-            if (_ledgeCheckDownDist > 0f &&
+            float sign  = Mathf.Sign(dir);
-                !Physics2D.Raycast(new Vector2(edgeX + sign * _ledgeCheckFwdOffset, b.min.y),
+            float edgeX = sign >= 0f ? b.max.x : b.min.x;
-                                   Vector2.down, _ledgeCheckDownDist, _groundMask))
+            return !Physics2D.Raycast(new Vector2(edgeX + sign * _ledgeCheckFwdOffset, b.min.y),
-                return true;
+                                      Vector2.down, _ledgeCheckDownDist, _groundMask);
-
-            return false;
         }
 
         private void WallAndLedgeCheck()
@@ -416,7 +422,11 @@ namespace BaseGames.Enemies
         public void MoveWithSpeed(float dir, float speed)
         {
             if (_isTurning) return;
-            UpdateFacing(dir);
+            if (dir != 0f) UpdateFacing(dir);
+            // 地面怪追击/导航：前缘将越过地形边缘(悬崖)则不前进——碰撞体边缘停在地形边缘、不越界。
+            // 只夹"悬崖"不夹"墙"(墙交给寻路绕行，免得贴墙路径被误夹停)；跨沟的 nav-link 跳/落
+            // 不经本方法(EnemyNavAgent 仅在 IsMovingOnSegment 时写 MoveSpeed)，故不影响跳跃/下落过沟。
+            if (dir != 0f && IsGrounded && WouldFallAhead(dir)) dir = 0f;
             var vel = _rb.velocity;
             vel.x = dir * speed;
             _rb.velocity = vel;