diff --git a/Assets/GameMain/Scripts/CustomComponent/PlayerInventory/PlayerInventoryComponent.cs b/Assets/GameMain/Scripts/CustomComponent/PlayerInventory/PlayerInventoryComponent.cs
index 4345918..6214604 100644
--- a/Assets/GameMain/Scripts/CustomComponent/PlayerInventory/PlayerInventoryComponent.cs
+++ b/Assets/GameMain/Scripts/CustomComponent/PlayerInventory/PlayerInventoryComponent.cs
@@ -106,7 +106,7 @@ namespace GeometryTD.CustomComponent
             _commandModel.AddGold(gainGold);
         }
 
-        public bool TryAddParticipantTower(long towerInstanceId, int maxCount = 4)
+        public ParticipantTowerAssignResult TryAddParticipantTower(long towerInstanceId, int maxCount = 4)
         {
             EnsureInitialized();
             return _towerRosterService.TryAddParticipantTower(towerInstanceId, maxCount);
diff --git a/Assets/GameMain/Scripts/CustomComponent/PlayerInventory/PlayerInventoryTowerRosterService.cs b/Assets/GameMain/Scripts/CustomComponent/PlayerInventory/PlayerInventoryTowerRosterService.cs
index 3a5eba8..2948af7 100644
--- a/Assets/GameMain/Scripts/CustomComponent/PlayerInventory/PlayerInventoryTowerRosterService.cs
+++ b/Assets/GameMain/Scripts/CustomComponent/PlayerInventory/PlayerInventoryTowerRosterService.cs
@@ -16,7 +16,7 @@ namespace GeometryTD.CustomComponent
             _maxParticipantTowerCount = Mathf.Max(1, maxParticipantTowerCount);
         }
 
-        public bool TryAddParticipantTower(long towerInstanceId, int maxCount)
+        public ParticipantTowerAssignResult TryAddParticipantTower(long towerInstanceId, int maxCount)
         {
             int resolvedMaxCount = Mathf.Max(1, maxCount);
             resolvedMaxCount = Mathf.Min(resolvedMaxCount, _maxParticipantTowerCount);
diff --git a/Assets/GameMain/Scripts/Definition/CombatParticipantTowerValidation.cs b/Assets/GameMain/Scripts/Definition/CombatParticipantTowerValidation.cs
new file mode 100644
index 0000000..0a8c3cf
--- /dev/null
+++ b/Assets/GameMain/Scripts/Definition/CombatParticipantTowerValidation.cs
@@ -0,0 +1,188 @@
+using System.Collections.Generic;
+
+namespace GeometryTD.Definition
+{
+    public enum CombatParticipantTowerValidationFailureReason
+    {
+        None = 0,
+        TowerMissing = 1,
+        MissingMuzzleComponent = 2,
+        MissingBearingComponent = 3,
+        MissingBaseComponent = 4
+    }
+
+    public sealed class CombatParticipantTowerValidationResult
+    {
+        public long TowerInstanceId { get; set; }
+
+        public bool IsValid => FailureReason == CombatParticipantTowerValidationFailureReason.None;
+
+        public CombatParticipantTowerValidationFailureReason FailureReason { get; set; }
+
+        public TowerItemData Tower { get; set; }
+    }
+
+    public sealed class CombatParticipantTowerValidationSummary
+    {
+        public IReadOnlyList<TowerItemData> ValidTowers { get; set; } = System.Array.Empty<TowerItemData>();
+
+        public IReadOnlyList<CombatParticipantTowerValidationResult> InvalidResults { get; set; } =
+            System.Array.Empty<CombatParticipantTowerValidationResult>();
+
+        public bool HasAnyValidParticipantTower => ValidTowers != null && ValidTowers.Count > 0;
+    }
+
+    public static class CombatParticipantTowerValidationService
+    {
+        public static CombatParticipantTowerValidationResult ValidateTower(
+            BackpackInventoryData inventory,
+            long towerInstanceId)
+        {
+            if (!TryGetTowerById(inventory, towerInstanceId, out TowerItemData tower))
+            {
+                return new CombatParticipantTowerValidationResult
+                {
+                    TowerInstanceId = towerInstanceId,
+                    FailureReason = CombatParticipantTowerValidationFailureReason.TowerMissing
+                };
+            }
+
+            return ValidateTower(inventory, tower);
+        }
+
+        public static CombatParticipantTowerValidationResult ValidateTower(
+            BackpackInventoryData inventory,
+            TowerItemData tower)
+        {
+            if (tower == null || tower.InstanceId <= 0)
+            {
+                return new CombatParticipantTowerValidationResult
+                {
+                    TowerInstanceId = tower != null ? tower.InstanceId : 0,
+                    Tower = tower,
+                    FailureReason = CombatParticipantTowerValidationFailureReason.TowerMissing
+                };
+            }
+
+            if (!HasComponent(inventory?.MuzzleComponents, tower.MuzzleComponentInstanceId))
+            {
+                return new CombatParticipantTowerValidationResult
+                {
+                    TowerInstanceId = tower.InstanceId,
+                    Tower = tower,
+                    FailureReason = CombatParticipantTowerValidationFailureReason.MissingMuzzleComponent
+                };
+            }
+
+            if (!HasComponent(inventory?.BearingComponents, tower.BearingComponentInstanceId))
+            {
+                return new CombatParticipantTowerValidationResult
+                {
+                    TowerInstanceId = tower.InstanceId,
+                    Tower = tower,
+                    FailureReason = CombatParticipantTowerValidationFailureReason.MissingBearingComponent
+                };
+            }
+
+            if (!HasComponent(inventory?.BaseComponents, tower.BaseComponentInstanceId))
+            {
+                return new CombatParticipantTowerValidationResult
+                {
+                    TowerInstanceId = tower.InstanceId,
+                    Tower = tower,
+                    FailureReason = CombatParticipantTowerValidationFailureReason.MissingBaseComponent
+                };
+            }
+
+            return new CombatParticipantTowerValidationResult
+            {
+                TowerInstanceId = tower.InstanceId,
+                Tower = tower,
+                FailureReason = CombatParticipantTowerValidationFailureReason.None
+            };
+        }
+
+        public static CombatParticipantTowerValidationSummary ValidateParticipantTowers(BackpackInventoryData inventory)
+        {
+            List<TowerItemData> validTowers = new List<TowerItemData>();
+            List<CombatParticipantTowerValidationResult> invalidResults =
+                new List<CombatParticipantTowerValidationResult>();
+            HashSet<long> processedTowerIds = new HashSet<long>();
+
+            if (inventory?.ParticipantTowerInstanceIds == null || inventory.ParticipantTowerInstanceIds.Count <= 0)
+            {
+                return new CombatParticipantTowerValidationSummary
+                {
+                    ValidTowers = validTowers,
+                    InvalidResults = invalidResults
+                };
+            }
+
+            for (int i = 0; i < inventory.ParticipantTowerInstanceIds.Count; i++)
+            {
+                long towerInstanceId = inventory.ParticipantTowerInstanceIds[i];
+                if (towerInstanceId <= 0 || !processedTowerIds.Add(towerInstanceId))
+                {
+                    continue;
+                }
+
+                CombatParticipantTowerValidationResult result = ValidateTower(inventory, towerInstanceId);
+                if (result.IsValid)
+                {
+                    validTowers.Add(result.Tower);
+                }
+                else
+                {
+                    invalidResults.Add(result);
+                }
+            }
+
+            return new CombatParticipantTowerValidationSummary
+            {
+                ValidTowers = validTowers,
+                InvalidResults = invalidResults
+            };
+        }
+
+        private static bool TryGetTowerById(BackpackInventoryData inventory, long towerInstanceId, out TowerItemData tower)
+        {
+            tower = null;
+            if (inventory?.Towers == null || towerInstanceId <= 0)
+            {
+                return false;
+            }
+
+            for (int i = 0; i < inventory.Towers.Count; i++)
+            {
+                TowerItemData candidate = inventory.Towers[i];
+                if (candidate != null && candidate.InstanceId == towerInstanceId)
+                {
+                    tower = candidate;
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        private static bool HasComponent<TComponent>(IReadOnlyList<TComponent> components, long componentInstanceId)
+            where TComponent : TowerCompItemData
+        {
+            if (components == null || componentInstanceId <= 0)
+            {
+                return false;
+            }
+
+            for (int i = 0; i < components.Count; i++)
+            {
+                TComponent component = components[i];
+                if (component != null && component.InstanceId == componentInstanceId)
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+    }
+}
diff --git a/Assets/GameMain/Scripts/Definition/CombatParticipantTowerValidation.cs.meta b/Assets/GameMain/Scripts/Definition/CombatParticipantTowerValidation.cs.meta
new file mode 100644
index 0000000..3d58a84
--- /dev/null
+++ b/Assets/GameMain/Scripts/Definition/CombatParticipantTowerValidation.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 3a8f51ad44094d59af6618736cd6a0d3
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/GameMain/Scripts/Definition/ParticipantTowerAssignResult.cs b/Assets/GameMain/Scripts/Definition/ParticipantTowerAssignResult.cs
new file mode 100644
index 0000000..91de081
--- /dev/null
+++ b/Assets/GameMain/Scripts/Definition/ParticipantTowerAssignResult.cs
@@ -0,0 +1,22 @@
+namespace GeometryTD.Definition
+{
+    public enum ParticipantTowerAssignFailureReason
+    {
+        None = 0,
+        TowerMissing = 1,
+        InvalidTower = 2,
+        AlreadyAssigned = 3,
+        ParticipantAreaFull = 4
+    }
+
+    public sealed class ParticipantTowerAssignResult
+    {
+        public long TowerInstanceId { get; set; }
+
+        public bool IsSuccess => FailureReason == ParticipantTowerAssignFailureReason.None;
+
+        public ParticipantTowerAssignFailureReason FailureReason { get; set; }
+
+        public CombatParticipantTowerValidationFailureReason ValidationFailureReason { get; set; }
+    }
+}
diff --git a/Assets/GameMain/Scripts/Definition/ParticipantTowerAssignResult.cs.meta b/Assets/GameMain/Scripts/Definition/ParticipantTowerAssignResult.cs.meta
new file mode 100644
index 0000000..bc6e844
--- /dev/null
+++ b/Assets/GameMain/Scripts/Definition/ParticipantTowerAssignResult.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 00c667d942b94e23a4933fda5c5eaf8e
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/GameMain/Scripts/Procedure/ProcedureMain.cs b/Assets/GameMain/Scripts/Procedure/ProcedureMain.cs
index b846abd..fe269bb 100644
--- a/Assets/GameMain/Scripts/Procedure/ProcedureMain.cs
+++ b/Assets/GameMain/Scripts/Procedure/ProcedureMain.cs
@@ -75,6 +75,26 @@ namespace GeometryTD.Procedure
         }
     }
 
+    public static class ProcedureMainNodeEventGuardService
+    {
+        public static bool MatchesCurrentNode(
+            RunState runState,
+            int nodeId,
+            RunNodeType nodeType,
+            int sequenceIndex)
+        {
+            RunNodeState currentNode = runState?.CurrentNode;
+            if (currentNode == null)
+            {
+                return false;
+            }
+
+            return (nodeId <= 0 || nodeId == currentNode.NodeId) &&
+                   (nodeType == RunNodeType.None || nodeType == currentNode.NodeType) &&
+                   (sequenceIndex < 0 || sequenceIndex == currentNode.SequenceIndex);
+        }
+    }
+
     public class ProcedureMain : ProcedureBase
     {
         public override bool UseNativeDialog => false;
@@ -177,19 +197,21 @@ namespace GeometryTD.Procedure
             }
 
             RunNodeState currentNode = _currentRunState?.CurrentNode;
-            if (currentNode != null &&
-                ((args.NodeId > 0 && args.NodeId != currentNode.NodeId) ||
-                 (args.NodeType != RunNodeType.None && args.NodeType != currentNode.NodeType) ||
-                 (args.SequenceIndex >= 0 && args.SequenceIndex != currentNode.SequenceIndex)))
+            if (!ProcedureMainNodeEventGuardService.MatchesCurrentNode(
+                    _currentRunState,
+                    args.NodeId,
+                    args.NodeType,
+                    args.SequenceIndex))
             {
                 Log.Warning(
                     "ProcedureMain.OnNodeEnter() node mismatch. EventNodeId={0}, EventNodeType={1}, EventSequenceIndex={2}; CurrentNodeId={3}, CurrentNodeType={4}, CurrentSequenceIndex={5}.",
                     args.NodeId,
                     args.NodeType,
                     args.SequenceIndex,
-                    currentNode.NodeId,
-                    currentNode.NodeType,
-                    currentNode.SequenceIndex);
+                    currentNode?.NodeId ?? 0,
+                    currentNode?.NodeType ?? RunNodeType.None,
+                    currentNode?.SequenceIndex ?? -1);
+                return;
             }
 
             Log.Info(
@@ -220,6 +242,24 @@ namespace GeometryTD.Procedure
                 return;
             }
 
+            RunNodeState currentNode = _currentRunState?.CurrentNode;
+            if (!ProcedureMainNodeEventGuardService.MatchesCurrentNode(
+                    _currentRunState,
+                    args.NodeId,
+                    args.NodeType,
+                    args.SequenceIndex))
+            {
+                Log.Warning(
+                    "ProcedureMain.OnNodeComplete() node mismatch. EventNodeId={0}, EventNodeType={1}, EventSequenceIndex={2}; CurrentNodeId={3}, CurrentNodeType={4}, CurrentSequenceIndex={5}.",
+                    args.NodeId,
+                    args.NodeType,
+                    args.SequenceIndex,
+                    currentNode?.NodeId ?? 0,
+                    currentNode?.NodeType ?? RunNodeType.None,
+                    currentNode?.SequenceIndex ?? -1);
+                return;
+            }
+
             Log.Info(
                 "ProcedureMain.OnNodeComplete() accepted. RunId={0}, NodeId={1}, NodeType={2}, SequenceIndex={3}, CompletionStatus={4}, CombatWon={5}.",
                 string.IsNullOrWhiteSpace(args.RunId) ? _currentRunState?.RunId : args.RunId,
diff --git a/Assets/GameMain/Scripts/UI/Game/Controller/RepoFormController.cs b/Assets/GameMain/Scripts/UI/Game/Controller/RepoFormController.cs
index c515806..3288874 100644
--- a/Assets/GameMain/Scripts/UI/Game/Controller/RepoFormController.cs
+++ b/Assets/GameMain/Scripts/UI/Game/Controller/RepoFormController.cs
@@ -261,8 +261,18 @@ namespace GeometryTD.UI
                 return;
             }
 
-            if (!_useCase.TryAddParticipantTower(args.TowerItemId))
+            ParticipantTowerAssignResult result = _useCase.TryAddParticipantTower(args.TowerItemId);
+            if (result == null || !result.IsSuccess)
             {
+                if (result != null)
+                {
+                    Log.Warning(
+                        "RepoFormController denied participant assignment. TowerId={0}, FailureReason={1}, ValidationFailureReason={2}.",
+                        result.TowerInstanceId,
+                        result.FailureReason,
+                        result.ValidationFailureReason);
+                }
+
                 return;
             }
 
diff --git a/Assets/GameMain/Scripts/UI/Game/UseCase/RepoFormUseCase.cs b/Assets/GameMain/Scripts/UI/Game/UseCase/RepoFormUseCase.cs
index e40b742..bfb14d2 100644
--- a/Assets/GameMain/Scripts/UI/Game/UseCase/RepoFormUseCase.cs
+++ b/Assets/GameMain/Scripts/UI/Game/UseCase/RepoFormUseCase.cs
@@ -33,7 +33,7 @@ namespace GeometryTD.UI
                 out _);
         }
 
-        public bool TryAddParticipantTower(long towerItemId)
+        public ParticipantTowerAssignResult TryAddParticipantTower(long towerItemId)
         {
             if (GameEntry.PlayerInventory == null)
             {
diff --git a/Assets/GameMain/Scripts/Utility/InventoryParticipantUtility.cs b/Assets/GameMain/Scripts/Utility/InventoryParticipantUtility.cs
index acff244..19f9dea 100644
--- a/Assets/GameMain/Scripts/Utility/InventoryParticipantUtility.cs
+++ b/Assets/GameMain/Scripts/Utility/InventoryParticipantUtility.cs
@@ -6,35 +6,75 @@ namespace GeometryTD.CustomUtility
 {
     public static class InventoryParticipantUtility
     {
-        public static bool TryAddParticipantTower(BackpackInventoryData inventory, long towerInstanceId, int maxCount)
+        public static ParticipantTowerAssignResult TryAddParticipantTower(
+            BackpackInventoryData inventory,
+            long towerInstanceId,
+            int maxCount)
         {
             if (inventory == null || towerInstanceId <= 0)
             {
-                return false;
+                return new ParticipantTowerAssignResult
+                {
+                    TowerInstanceId = towerInstanceId,
+                    FailureReason = ParticipantTowerAssignFailureReason.TowerMissing,
+                    ValidationFailureReason = CombatParticipantTowerValidationFailureReason.None
+                };
             }
 
             int resolvedMaxCount = Mathf.Max(1, maxCount);
             NormalizeParticipantState(inventory, resolvedMaxCount);
-            if (!TryGetTowerById(inventory, towerInstanceId, out TowerItemData tower))
+            CombatParticipantTowerValidationResult validationResult =
+                CombatParticipantTowerValidationService.ValidateTower(inventory, towerInstanceId);
+            if (!validationResult.IsValid)
             {
-                return false;
+                return new ParticipantTowerAssignResult
+                {
+                    TowerInstanceId = towerInstanceId,
+                    FailureReason = validationResult.FailureReason == CombatParticipantTowerValidationFailureReason.TowerMissing
+                        ? ParticipantTowerAssignFailureReason.TowerMissing
+                        : ParticipantTowerAssignFailureReason.InvalidTower,
+                    ValidationFailureReason = validationResult.FailureReason
+                };
             }
 
             inventory.ParticipantTowerInstanceIds ??= new List<long>();
             if (inventory.ParticipantTowerInstanceIds.Contains(towerInstanceId))
             {
-                tower.IsParticipatingInCombat = true;
-                return false;
+                if (validationResult.Tower != null)
+                {
+                    validationResult.Tower.IsParticipatingInCombat = true;
+                }
+
+                return new ParticipantTowerAssignResult
+                {
+                    TowerInstanceId = towerInstanceId,
+                    FailureReason = ParticipantTowerAssignFailureReason.AlreadyAssigned,
+                    ValidationFailureReason = CombatParticipantTowerValidationFailureReason.None
+                };
             }
 
             if (inventory.ParticipantTowerInstanceIds.Count >= resolvedMaxCount)
             {
-                return false;
+                return new ParticipantTowerAssignResult
+                {
+                    TowerInstanceId = towerInstanceId,
+                    FailureReason = ParticipantTowerAssignFailureReason.ParticipantAreaFull,
+                    ValidationFailureReason = CombatParticipantTowerValidationFailureReason.None
+                };
             }
 
             inventory.ParticipantTowerInstanceIds.Add(towerInstanceId);
-            tower.IsParticipatingInCombat = true;
-            return true;
+            if (validationResult.Tower != null)
+            {
+                validationResult.Tower.IsParticipatingInCombat = true;
+            }
+
+            return new ParticipantTowerAssignResult
+            {
+                TowerInstanceId = towerInstanceId,
+                FailureReason = ParticipantTowerAssignFailureReason.None,
+                ValidationFailureReason = CombatParticipantTowerValidationFailureReason.None
+            };
         }
 
         public static bool TryRemoveParticipantTower(BackpackInventoryData inventory, long towerInstanceId, int maxCount)
diff --git a/Assets/Tests/EditMode/CombatParticipantTowerValidationServiceTests.cs b/Assets/Tests/EditMode/CombatParticipantTowerValidationServiceTests.cs
new file mode 100644
index 0000000..b3f9714
--- /dev/null
+++ b/Assets/Tests/EditMode/CombatParticipantTowerValidationServiceTests.cs
@@ -0,0 +1,199 @@
+using System.Linq;
+using GeometryTD.Definition;
+using NUnit.Framework;
+
+namespace GeometryTD.Tests.EditMode
+{
+    public sealed class CombatParticipantTowerValidationServiceTests
+    {
+        [Test]
+        public void ValidateTower_Returns_Valid_When_Tower_And_Three_Components_Exist()
+        {
+            BackpackInventoryData inventory = CreateInventory();
+
+            CombatParticipantTowerValidationResult result =
+                CombatParticipantTowerValidationService.ValidateTower(inventory, 90001);
+
+            Assert.That(result.IsValid, Is.True);
+            Assert.That(result.TowerInstanceId, Is.EqualTo(90001));
+            Assert.That(result.FailureReason, Is.EqualTo(CombatParticipantTowerValidationFailureReason.None));
+            Assert.That(result.Tower, Is.Not.Null);
+        }
+
+        [Test]
+        public void ValidateTower_Returns_TowerMissing_When_Tower_Does_Not_Exist()
+        {
+            BackpackInventoryData inventory = CreateInventory();
+
+            CombatParticipantTowerValidationResult result =
+                CombatParticipantTowerValidationService.ValidateTower(inventory, 12345);
+
+            Assert.That(result.IsValid, Is.False);
+            Assert.That(result.TowerInstanceId, Is.EqualTo(12345));
+            Assert.That(result.FailureReason, Is.EqualTo(CombatParticipantTowerValidationFailureReason.TowerMissing));
+        }
+
+        [Test]
+        public void ValidateTower_Returns_MissingMuzzle_When_Muzzle_Is_Not_Resolvable()
+        {
+            BackpackInventoryData inventory = CreateInventory();
+            inventory.Towers[0].MuzzleComponentInstanceId = 99901;
+
+            CombatParticipantTowerValidationResult result =
+                CombatParticipantTowerValidationService.ValidateTower(inventory, inventory.Towers[0]);
+
+            Assert.That(result.IsValid, Is.False);
+            Assert.That(result.FailureReason,
+                Is.EqualTo(CombatParticipantTowerValidationFailureReason.MissingMuzzleComponent));
+        }
+
+        [Test]
+        public void ValidateTower_Returns_MissingBearing_When_Bearing_Is_Not_Resolvable()
+        {
+            BackpackInventoryData inventory = CreateInventory();
+            inventory.Towers[0].BearingComponentInstanceId = 99902;
+
+            CombatParticipantTowerValidationResult result =
+                CombatParticipantTowerValidationService.ValidateTower(inventory, inventory.Towers[0]);
+
+            Assert.That(result.IsValid, Is.False);
+            Assert.That(result.FailureReason,
+                Is.EqualTo(CombatParticipantTowerValidationFailureReason.MissingBearingComponent));
+        }
+
+        [Test]
+        public void ValidateTower_Returns_MissingBase_When_Base_Is_Not_Resolvable()
+        {
+            BackpackInventoryData inventory = CreateInventory();
+            inventory.Towers[0].BaseComponentInstanceId = 99903;
+
+            CombatParticipantTowerValidationResult result =
+                CombatParticipantTowerValidationService.ValidateTower(inventory, inventory.Towers[0]);
+
+            Assert.That(result.IsValid, Is.False);
+            Assert.That(result.FailureReason,
+                Is.EqualTo(CombatParticipantTowerValidationFailureReason.MissingBaseComponent));
+        }
+
+        [Test]
+        public void ValidateParticipantTowers_Splits_Valid_And_Invalid_Towers()
+        {
+            BackpackInventoryData inventory = CreateInventory();
+            inventory.Towers.Add(new TowerItemData
+            {
+                InstanceId = 90002,
+                Name = "非法塔",
+                MuzzleComponentInstanceId = 10001,
+                BearingComponentInstanceId = 20001,
+                BaseComponentInstanceId = 99903,
+                Stats = new TowerStatsData()
+            });
+            inventory.ParticipantTowerInstanceIds.Add(90002);
+
+            CombatParticipantTowerValidationSummary summary =
+                CombatParticipantTowerValidationService.ValidateParticipantTowers(inventory);
+
+            Assert.That(summary.HasAnyValidParticipantTower, Is.True);
+            Assert.That(summary.ValidTowers.Count, Is.EqualTo(1));
+            Assert.That(summary.ValidTowers[0].InstanceId, Is.EqualTo(90001));
+            Assert.That(summary.InvalidResults.Count, Is.EqualTo(1));
+            Assert.That(summary.InvalidResults[0].TowerInstanceId, Is.EqualTo(90002));
+            Assert.That(summary.InvalidResults[0].FailureReason,
+                Is.EqualTo(CombatParticipantTowerValidationFailureReason.MissingBaseComponent));
+        }
+
+        [Test]
+        public void ValidateParticipantTowers_Treats_Zero_Endurance_As_Valid_For_S3_01()
+        {
+            BackpackInventoryData inventory = CreateInventory();
+            inventory.MuzzleComponents[0].Endurance = 0f;
+            inventory.BearingComponents[0].Endurance = 0f;
+            inventory.BaseComponents[0].Endurance = 0f;
+
+            CombatParticipantTowerValidationSummary summary =
+                CombatParticipantTowerValidationService.ValidateParticipantTowers(inventory);
+
+            Assert.That(summary.HasAnyValidParticipantTower, Is.True);
+            Assert.That(summary.ValidTowers.Count, Is.EqualTo(1));
+            Assert.That(summary.InvalidResults.Count, Is.EqualTo(0));
+        }
+
+        [Test]
+        public void ValidateParticipantTowers_Does_Not_Require_TowerStats()
+        {
+            BackpackInventoryData inventory = CreateInventory();
+            inventory.Towers[0].Stats = null;
+
+            CombatParticipantTowerValidationResult result =
+                CombatParticipantTowerValidationService.ValidateTower(inventory, inventory.Towers[0]);
+
+            Assert.That(result.IsValid, Is.True);
+            Assert.That(result.FailureReason, Is.EqualTo(CombatParticipantTowerValidationFailureReason.None));
+        }
+
+        [Test]
+        public void ValidateParticipantTowers_Handles_Empty_And_Duplicate_Participant_Ids()
+        {
+            BackpackInventoryData emptyInventory = CreateInventory();
+            emptyInventory.ParticipantTowerInstanceIds.Clear();
+
+            CombatParticipantTowerValidationSummary emptySummary =
+                CombatParticipantTowerValidationService.ValidateParticipantTowers(emptyInventory);
+
+            Assert.That(emptySummary.HasAnyValidParticipantTower, Is.False);
+            Assert.That(emptySummary.ValidTowers.Count, Is.EqualTo(0));
+            Assert.That(emptySummary.InvalidResults.Count, Is.EqualTo(0));
+
+            BackpackInventoryData duplicateInventory = CreateInventory();
+            duplicateInventory.ParticipantTowerInstanceIds.Add(90001);
+            duplicateInventory.ParticipantTowerInstanceIds.Add(99999);
+            duplicateInventory.ParticipantTowerInstanceIds.Add(99999);
+
+            CombatParticipantTowerValidationSummary duplicateSummary =
+                CombatParticipantTowerValidationService.ValidateParticipantTowers(duplicateInventory);
+
+            Assert.That(duplicateSummary.ValidTowers.Count, Is.EqualTo(1));
+            Assert.That(duplicateSummary.InvalidResults.Count, Is.EqualTo(1));
+            Assert.That(duplicateSummary.InvalidResults.Single().TowerInstanceId, Is.EqualTo(99999));
+            Assert.That(duplicateSummary.InvalidResults.Single().FailureReason,
+                Is.EqualTo(CombatParticipantTowerValidationFailureReason.TowerMissing));
+        }
+
+        private static BackpackInventoryData CreateInventory()
+        {
+            BackpackInventoryData inventory = new BackpackInventoryData();
+
+            inventory.MuzzleComponents.Add(new MuzzleCompItemData
+            {
+                InstanceId = 10001,
+                Name = "枪口",
+                Endurance = 100f
+            });
+            inventory.BearingComponents.Add(new BearingCompItemData
+            {
+                InstanceId = 20001,
+                Name = "轴承",
+                Endurance = 100f
+            });
+            inventory.BaseComponents.Add(new BaseCompItemData
+            {
+                InstanceId = 30001,
+                Name = "底座",
+                Endurance = 100f
+            });
+
+            inventory.Towers.Add(new TowerItemData
+            {
+                InstanceId = 90001,
+                Name = "合法塔",
+                MuzzleComponentInstanceId = 10001,
+                BearingComponentInstanceId = 20001,
+                BaseComponentInstanceId = 30001,
+                Stats = new TowerStatsData()
+            });
+
+            inventory.ParticipantTowerInstanceIds.Add(90001);
+            return inventory;
+        }
+    }
+}
diff --git a/Assets/Tests/EditMode/CombatParticipantTowerValidationServiceTests.cs.meta b/Assets/Tests/EditMode/CombatParticipantTowerValidationServiceTests.cs.meta
new file mode 100644
index 0000000..e9c5707
--- /dev/null
+++ b/Assets/Tests/EditMode/CombatParticipantTowerValidationServiceTests.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 8abdddb33ee9436aad59df649f03bc57
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Tests/EditMode/ParticipantTowerAssignResultTests.cs b/Assets/Tests/EditMode/ParticipantTowerAssignResultTests.cs
new file mode 100644
index 0000000..0452887
--- /dev/null
+++ b/Assets/Tests/EditMode/ParticipantTowerAssignResultTests.cs
@@ -0,0 +1,136 @@
+using GeometryTD.CustomUtility;
+using GeometryTD.Definition;
+using NUnit.Framework;
+
+namespace GeometryTD.Tests.EditMode
+{
+    public sealed class ParticipantTowerAssignResultTests
+    {
+        [Test]
+        public void TryAddParticipantTower_Returns_Success_For_Legal_Tower()
+        {
+            BackpackInventoryData inventory = CreateValidInventory();
+
+            ParticipantTowerAssignResult result = InventoryParticipantUtility.TryAddParticipantTower(inventory, 90001, 4);
+
+            Assert.That(result, Is.Not.Null);
+            Assert.That(result.IsSuccess, Is.True);
+            Assert.That(result.FailureReason, Is.EqualTo(ParticipantTowerAssignFailureReason.None));
+            Assert.That(result.ValidationFailureReason, Is.EqualTo(CombatParticipantTowerValidationFailureReason.None));
+            Assert.That(inventory.ParticipantTowerInstanceIds.Count, Is.EqualTo(1));
+            Assert.That(inventory.ParticipantTowerInstanceIds[0], Is.EqualTo(90001));
+            Assert.That(inventory.Towers[0].IsParticipatingInCombat, Is.True);
+        }
+
+        [Test]
+        public void TryAddParticipantTower_Returns_TowerMissing_When_Tower_Is_Not_Found()
+        {
+            BackpackInventoryData inventory = CreateValidInventory();
+
+            ParticipantTowerAssignResult result = InventoryParticipantUtility.TryAddParticipantTower(inventory, 99999, 4);
+
+            Assert.That(result.IsSuccess, Is.False);
+            Assert.That(result.FailureReason, Is.EqualTo(ParticipantTowerAssignFailureReason.TowerMissing));
+            Assert.That(result.ValidationFailureReason,
+                Is.EqualTo(CombatParticipantTowerValidationFailureReason.TowerMissing));
+            Assert.That(inventory.ParticipantTowerInstanceIds.Count, Is.EqualTo(0));
+        }
+
+        [Test]
+        public void TryAddParticipantTower_Returns_InvalidTower_With_Missing_Component_Reason()
+        {
+            BackpackInventoryData inventory = CreateValidInventory();
+            inventory.Towers[0].BaseComponentInstanceId = 33333;
+
+            ParticipantTowerAssignResult result = InventoryParticipantUtility.TryAddParticipantTower(inventory, 90001, 4);
+
+            Assert.That(result.IsSuccess, Is.False);
+            Assert.That(result.FailureReason, Is.EqualTo(ParticipantTowerAssignFailureReason.InvalidTower));
+            Assert.That(result.ValidationFailureReason,
+                Is.EqualTo(CombatParticipantTowerValidationFailureReason.MissingBaseComponent));
+            Assert.That(inventory.ParticipantTowerInstanceIds.Count, Is.EqualTo(0));
+        }
+
+        [Test]
+        public void TryAddParticipantTower_Returns_AlreadyAssigned_Without_Duplicating_List()
+        {
+            BackpackInventoryData inventory = CreateValidInventory();
+            inventory.ParticipantTowerInstanceIds.Add(90001);
+            inventory.Towers[0].IsParticipatingInCombat = true;
+
+            ParticipantTowerAssignResult result = InventoryParticipantUtility.TryAddParticipantTower(inventory, 90001, 4);
+
+            Assert.That(result.IsSuccess, Is.False);
+            Assert.That(result.FailureReason, Is.EqualTo(ParticipantTowerAssignFailureReason.AlreadyAssigned));
+            Assert.That(result.ValidationFailureReason, Is.EqualTo(CombatParticipantTowerValidationFailureReason.None));
+            Assert.That(inventory.ParticipantTowerInstanceIds.Count, Is.EqualTo(1));
+        }
+
+        [Test]
+        public void TryAddParticipantTower_Returns_ParticipantAreaFull_When_MaxCount_Reached()
+        {
+            BackpackInventoryData inventory = CreateInventoryWithFourParticipantTowers();
+
+            ParticipantTowerAssignResult result = InventoryParticipantUtility.TryAddParticipantTower(inventory, 90005, 4);
+
+            Assert.That(result.IsSuccess, Is.False);
+            Assert.That(result.FailureReason, Is.EqualTo(ParticipantTowerAssignFailureReason.ParticipantAreaFull));
+            Assert.That(result.ValidationFailureReason, Is.EqualTo(CombatParticipantTowerValidationFailureReason.None));
+            Assert.That(inventory.ParticipantTowerInstanceIds.Count, Is.EqualTo(4));
+            Assert.That(inventory.Towers[4].IsParticipatingInCombat, Is.False);
+        }
+
+        private static BackpackInventoryData CreateValidInventory()
+        {
+            BackpackInventoryData inventory = new BackpackInventoryData();
+            inventory.MuzzleComponents.Add(new MuzzleCompItemData { InstanceId = 10001, Name = "枪口" });
+            inventory.BearingComponents.Add(new BearingCompItemData { InstanceId = 20001, Name = "轴承" });
+            inventory.BaseComponents.Add(new BaseCompItemData { InstanceId = 30001, Name = "底座" });
+            inventory.Towers.Add(new TowerItemData
+            {
+                InstanceId = 90001,
+                Name = "合法塔",
+                MuzzleComponentInstanceId = 10001,
+                BearingComponentInstanceId = 20001,
+                BaseComponentInstanceId = 30001,
+                Stats = new TowerStatsData()
+            });
+
+            return inventory;
+        }
+
+        private static BackpackInventoryData CreateInventoryWithFourParticipantTowers()
+        {
+            BackpackInventoryData inventory = new BackpackInventoryData();
+
+            for (int i = 0; i < 5; i++)
+            {
+                long towerId = 90001 + i;
+                long muzzleId = 10001 + i;
+                long bearingId = 20001 + i;
+                long baseId = 30001 + i;
+
+                inventory.MuzzleComponents.Add(new MuzzleCompItemData { InstanceId = muzzleId, Name = $"枪口-{i}" });
+                inventory.BearingComponents.Add(new BearingCompItemData { InstanceId = bearingId, Name = $"轴承-{i}" });
+                inventory.BaseComponents.Add(new BaseCompItemData { InstanceId = baseId, Name = $"底座-{i}" });
+                inventory.Towers.Add(new TowerItemData
+                {
+                    InstanceId = towerId,
+                    Name = $"塔-{i}",
+                    MuzzleComponentInstanceId = muzzleId,
+                    BearingComponentInstanceId = bearingId,
+                    BaseComponentInstanceId = baseId,
+                    Stats = new TowerStatsData(),
+                    IsParticipatingInCombat = i < 4
+                });
+
+                if (i < 4)
+                {
+                    inventory.ParticipantTowerInstanceIds.Add(towerId);
+                }
+            }
+
+            return inventory;
+        }
+    }
+}
diff --git a/Assets/Tests/EditMode/ParticipantTowerAssignResultTests.cs.meta b/Assets/Tests/EditMode/ParticipantTowerAssignResultTests.cs.meta
new file mode 100644
index 0000000..a7aac7e
--- /dev/null
+++ b/Assets/Tests/EditMode/ParticipantTowerAssignResultTests.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 0053c263319b48eb930ef0d7794fb9dd
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Tests/EditMode/ProcedureMainServicesTests.cs b/Assets/Tests/EditMode/ProcedureMainServicesTests.cs
index e0ce049..80d9278 100644
--- a/Assets/Tests/EditMode/ProcedureMainServicesTests.cs
+++ b/Assets/Tests/EditMode/ProcedureMainServicesTests.cs
@@ -89,6 +89,52 @@ namespace GeometryTD.Tests.EditMode
             Assert.That(completedRun.RunInventorySnapshot.Gold, Is.EqualTo(10));
         }
 
+        [Test]
+        public void MatchesCurrentNode_Returns_True_For_Current_Node_And_Default_Wildcards()
+        {
+            RunState runState = CreateTwoNodeRun();
+
+            bool exactMatch = ProcedureMainNodeEventGuardService.MatchesCurrentNode(
+                runState,
+                101,
+                RunNodeType.Combat,
+                0);
+            bool wildcardMatch = ProcedureMainNodeEventGuardService.MatchesCurrentNode(
+                runState,
+                0,
+                RunNodeType.None,
+                -1);
+
+            Assert.That(exactMatch, Is.True);
+            Assert.That(wildcardMatch, Is.True);
+        }
+
+        [Test]
+        public void MatchesCurrentNode_Returns_False_For_Mismatched_Node_Event()
+        {
+            RunState runState = CreateTwoNodeRun();
+
+            bool nodeIdMismatch = ProcedureMainNodeEventGuardService.MatchesCurrentNode(
+                runState,
+                999,
+                RunNodeType.Combat,
+                0);
+            bool nodeTypeMismatch = ProcedureMainNodeEventGuardService.MatchesCurrentNode(
+                runState,
+                101,
+                RunNodeType.Shop,
+                0);
+            bool sequenceMismatch = ProcedureMainNodeEventGuardService.MatchesCurrentNode(
+                runState,
+                101,
+                RunNodeType.Combat,
+                1);
+
+            Assert.That(nodeIdMismatch, Is.False);
+            Assert.That(nodeTypeMismatch, Is.False);
+            Assert.That(sequenceMismatch, Is.False);
+        }
+
         [Test]
         public void TryEnterCompletedPendingFinish_Shows_Dialog_Only_Once()
         {
diff --git a/Assets/Tests/EditMode/RunStateTests.cs b/Assets/Tests/EditMode/RunStateTests.cs
index 9dc1d3f..2ce4502 100644
--- a/Assets/Tests/EditMode/RunStateTests.cs
+++ b/Assets/Tests/EditMode/RunStateTests.cs
@@ -107,7 +107,7 @@ namespace GeometryTD.Tests.EditMode
         }
 
         [Test]
-        public void NodeCompleteEventArgs_Clones_Inventory_And_Clears_State()
+        public void NodeCompleteEventArgs_Completed_Win_Clones_Inventory_And_Clears_State()
         {
             BackpackInventoryData inventory = new BackpackInventoryData { Gold = 66 };
             NodeCompleteEventArgs eventArgs = NodeCompleteEventArgs.Create(
@@ -140,6 +140,54 @@ namespace GeometryTD.Tests.EditMode
             Assert.That(eventArgs.InventorySnapshotAfterNode, Is.Null);
         }
 
+        [Test]
+        public void NodeCompleteEventArgs_Completed_Loss_Preserves_NonWin_Semantics()
+        {
+            BackpackInventoryData inventory = new BackpackInventoryData { Gold = 12 };
+            NodeCompleteEventArgs eventArgs = NodeCompleteEventArgs.Create(
+                "run-2",
+                8,
+                RunNodeType.Combat,
+                4,
+                RunNodeCompletionStatus.Completed,
+                false,
+                inventory);
+
+            inventory.Gold = 99;
+
+            Assert.That(eventArgs.RunId, Is.EqualTo("run-2"));
+            Assert.That(eventArgs.NodeId, Is.EqualTo(8));
+            Assert.That(eventArgs.NodeType, Is.EqualTo(RunNodeType.Combat));
+            Assert.That(eventArgs.SequenceIndex, Is.EqualTo(4));
+            Assert.That(eventArgs.CompletionStatus, Is.EqualTo(RunNodeCompletionStatus.Completed));
+            Assert.That(eventArgs.CombatWon, Is.False);
+            Assert.That(eventArgs.InventorySnapshotAfterNode.Gold, Is.EqualTo(12));
+        }
+
+        [Test]
+        public void NodeCompleteEventArgs_Exception_Preserves_Exception_Semantics()
+        {
+            BackpackInventoryData inventory = new BackpackInventoryData { Gold = 7 };
+            NodeCompleteEventArgs eventArgs = NodeCompleteEventArgs.Create(
+                "run-3",
+                9,
+                RunNodeType.BossCombat,
+                5,
+                RunNodeCompletionStatus.Exception,
+                false,
+                inventory);
+
+            inventory.Gold = 100;
+
+            Assert.That(eventArgs.RunId, Is.EqualTo("run-3"));
+            Assert.That(eventArgs.NodeId, Is.EqualTo(9));
+            Assert.That(eventArgs.NodeType, Is.EqualTo(RunNodeType.BossCombat));
+            Assert.That(eventArgs.SequenceIndex, Is.EqualTo(5));
+            Assert.That(eventArgs.CompletionStatus, Is.EqualTo(RunNodeCompletionStatus.Exception));
+            Assert.That(eventArgs.CombatWon, Is.False);
+            Assert.That(eventArgs.InventorySnapshotAfterNode.Gold, Is.EqualTo(7));
+        }
+
         [Test]
         public void FixedRunNodeSequenceBuilder_Builds_Plain_Ten_Node_Sequence()
         {
diff --git a/docs/CodeX-TODO.md b/docs/CodeX-TODO.md
index 26c74b3..1c3d8cb 100644
--- a/docs/CodeX-TODO.md
+++ b/docs/CodeX-TODO.md
@@ -1,6 +1,6 @@
 # CodeX TODO
 
-最后更新：2026-03-08
+最后更新：2026-03-09
 
 > 目标：基于当前仓库现状，为 `docs/TODO.md` 的 M1 收口补一份更可执行的补充顺序。
 > 原则：先收主流程，再补硬规则，最后统一文档与验收口径。
@@ -53,6 +53,8 @@
 - [x] `ProcedureMainRunFlowService` 的成功推进、异常回退、`RunCompleted`、`NoChange` 分支测试已补齐并全部通过。
 - [x] `ProcedureMainRunCompletionService` 的“只弹一次结束对话框”和“只在完成态允许回菜单”测试已补齐并全部通过。
 
+> 2026-03-09 更新：已补 `NodeCompleteEventArgs` 三种语义测试，以及 `ProcedureMain` 当前节点匹配守卫测试；你已确认本轮在 Unity Test Runner 中重新实跑 `Assets/Tests/EditMode` 且全部通过。
+
 ### S1 通过标准
 
 - [x] 从主菜单开始，一条 Run 可以稳定经历“节点进入 -> 节点完成 / 异常回流 -> Boss 完成 -> 正式结束态 -> 返回主菜单”，且过程中不会出现错误推进、重复进入、Boss 后回到普通 Hub、或 UI 残留。
@@ -61,9 +63,9 @@
 
 ### 当前实现
 
-- `ProcedureMain + NodeMapForm` 已能创建固定 10 节点 Run，并驱动战斗 / 事件 / 商店三类节点的临时入口。
+- `ProcedureMain + NodeMapForm` 已能创建固定 10 节点 Run，并驱动战斗 / 事件 / 商店三类节点的主流程入口。
 - `RunState`、`FixedRunNodeSequenceBuilder`、`RunStateAdvanceService` 与对应 Editor 测试已存在，说明 Run 模型、固定序列、节点推进基础能力已经落地。
-- 战斗节点已有结算、奖励选择、失败返回；事件和商店节点也会发出 `NodeEnterEventArgs / NodeCompleteEventArgs`，但主流程仍属于“临时闭环”。
+- 战斗节点已有结算、奖励选择、失败返回；事件和商店节点也会发出 `NodeEnterEventArgs / NodeCompleteEventArgs`，主流程闭环已能稳定走通。
 - `P0-10 ~ P0-12` 不是纯空白：
   - 出战前已有“参与区至少有 1 座塔”的最低门槛；
   - 品质 / Tag 已在组装、商店、展示链路中分散使用；
@@ -72,34 +74,51 @@
 ### M1 目标状态
 
 - M1 验收口径应以“从开始游戏到 Boss 节点结算结束，当前 Run 能稳定走完整条链”为准。
-- `NodeMapForm` 在 M1 里应被视为正式节点地图入口，而不是只靠临时面板勉强串流程。
+- `NodeMapForm` 已可视为 M1 所需的节点流程界面；M1 不额外要求节点地图选择 UI 或表现层打磨。
 - 战斗 / 事件 / 商店都需要统一节点进入、完成、失败后的回流方式，避免每类节点各走一套。
 - 出战合法性需要从“至少有参战塔”收口为“满足完整三组件条件才可出战”。
 
 ### 仍未完成
 
-- Run 完成后的正式结束态、Boss 后收尾表现、统一的主流程回流仍未收口。
-- 节点地图表现仍缺正式状态表达、说明文案与反馈，不应把这部分误记为已完成。
+- 出战合法性仍停留在“参与区至少有 1 座塔”的最低门槛，尚未收口为“三组件完整合法参战”。
 - 品质 / Tag / 耐久在代码里已有局部实现，但还没有统一规则入口，因此仍应视为未收口项，而不是 M1 已完成项。
 
-## 阶段 S2 - 收口节点地图表现
+## 阶段 S2 - 对齐节点流程 UI 的 MVP 口径
 
 | 状态  | ID    | 任务                             | 交付物路径                              | 验收标准                   |
 |-----|-------|--------------------------------|------------------------------------|------------------------|
-| [ ] | S2-01 | 把 `NodeMapForm` 从临时面板收口成正式节点地图 | `Assets/GameMain/Scripts/UI/Game/` | 节点地图不再只是临时占位面板         |
-| [ ] | S2-02 | 补齐节点状态、当前节点、完成态、Boss 节点表现      | `Assets/GameMain/Scripts/UI/Game/` | 玩家能一眼读懂当前 Run 进度       |
-| [ ] | S2-03 | 补齐节点说明、反馈、回流提示                 | `Assets/GameMain/Scripts/UI/Game/` | 节点点击、进入、完成、失败均有明确反馈    |
-| [ ] | S2-04 | 统一节点地图与主 HUD / MainForm 的职责边界  | `Assets/GameMain/Scripts/UI/Game/` | Hub UI 职责清晰，不再重复表达同类信息 |
+| [x] | S2-01 | 确认 `NodeMapForm` 已满足 M1 所需的节点流程界面 | `docs/CodeX-TODO.md`<br>`docs/TODO.md` | 不再把“正式节点地图表现”视为 M1 阻塞项 |
+| [x] | S2-02 | 明确 M1 不扩展节点地图选择 UI 与表现层打磨      | `docs/CodeX-TODO.md`<br>`docs/MVP-Scope.md` | 与 `MVP-Scope.md` 的范围口径一致 |
 
 ## 阶段 S3 - 收口出战合法性
 
 | 状态  | ID    | 任务               | 交付物路径                                                                                            | 验收标准               |
 |-----|-------|------------------|--------------------------------------------------------------------------------------------------|--------------------|
-| [ ] | S3-01 | 定义“合法参战塔”的最终判定口径 | `docs/CodeX-TODO.md`<br>`Assets/GameMain/Scripts/Definition/`                                    | 流程层与 UI 层共用同一套判定口径 |
-| [ ] | S3-02 | 收口组装区与参战区的合法性校验  | `Assets/GameMain/Scripts/UI/Game/`<br>`Assets/GameMain/Scripts/CustomComponent/PlayerInventory/` | 不合法塔不能进入参战区        |
+| [x] | S3-01 | 定义“合法参战塔”的最终判定口径 | `docs/CodeX-TODO.md`<br>`Assets/GameMain/Scripts/Definition/`                                    | 流程层与 UI 层共用同一套判定口径 |
+| [x] | S3-02 | 收口组装区与参战区的合法性校验  | `Assets/GameMain/Scripts/UI/Game/`<br>`Assets/GameMain/Scripts/CustomComponent/PlayerInventory/` | 不合法塔不能进入参战区        |
 | [ ] | S3-03 | 在战斗入口补齐最终出战校验    | `Assets/GameMain/Scripts/Procedure/`                                                             | 不满足完整条件时无法进入战斗节点   |
 | [ ] | S3-04 | 给出 UI / 日志层明确反馈  | `Assets/GameMain/Scripts/UI/Game/`<br>`Assets/GameMain/Scripts/Procedure/`                       | 玩家知道为什么不能出战        |
 
+### S3-01 判定口径
+
+- `S3-01` 只收口 M1 所需的最小合法参战规则：塔实例存在，且能解析到枪口 / 轴承 / 底座三个组件实例。
+- 当前阶段不把品质、Tag、耐久、属性强度纳入“合法参战塔”定义；这些仍分别留在 `S4`、`S5` 收口。
+- 流程层、库存层、UI 层后续都必须共用同一个判定入口，不能再分别维护“至少有塔”“参战区非空”“组件看起来完整”这类分散判断。
+- 判定结果不能只返回 `bool`，还要能区分至少以下失败原因：塔不存在、缺枪口、缺轴承、缺底座。
+- 批量校验参战区时，需要同时给出“合法参战塔列表”“非法参战塔及原因”“是否至少存在一座合法参战塔”三个结果，供 `S3-02 ~ S3-04` 直接复用。
+
+> 2026-03-09 更新：`CombatParticipantTowerValidationService`、`CombatParticipantTowerValidationResult`、`CombatParticipantTowerValidationSummary` 已落地；Unity Test Runner 已确认相关 EditMode 测试通过。
+
+### S3-02 当前落地状态
+
+- 参战分配链路已统一改为返回结果对象，而不是只返回 `bool`。
+- `RepoFormUseCase`、`PlayerInventoryComponent`、`PlayerInventoryTowerRosterService`、`InventoryParticipantUtility` 已接入 `S3-01` 的统一合法性校验入口。
+- 当前可稳定区分以下分配失败原因：塔不存在、塔缺少三组件之一、已在参战区、参战区已满。
+- 组装区 / 参战区 UI 仍保持“失败时静默拦截”的当前策略，但日志链路已经能拿到明确失败原因，后续 `S3-04` 可直接复用。
+- 当前阶段仍未在战斗入口做最终出战前二次校验，这部分继续归 `S3-03`。
+
+> 2026-03-09 更新：你已在 Unity Test Runner 中确认 `Assets/Tests/EditMode` 全部通过，其中包含 `CombatParticipantTowerValidationServiceTests` 与 `ParticipantTowerAssignResultTests`。
+
 ## 阶段 S4 - 收口品质 / Tag 规则
 
 | 状态  | ID    | 任务                      | 交付物路径                                                                                               | 验收标准           |
@@ -130,18 +149,18 @@
 ## 推荐执行顺序
 
 1. 先做 `S1`，把主流程真正收成一条稳定可验收的链。
-2. 再做 `S2`，把当前临时 `NodeMapForm` 收成正式节点地图表现。
-3. 然后做 `S3`，补齐出战合法性，解决 `P0-10`。
+2. `S2` 已完成口径对齐，`NodeMapForm` 不再作为 M1 阻塞项。
+3. 接下来优先做 `S3`，补齐出战合法性，解决 `P0-10`。
 4. 再做 `S4`，统一品质 / Tag 的规则口径，解决 `P0-11`。
 5. 最后做 `S5`，决定耐久是完整收口还是同步缩范围，解决 `P0-12`。
 6. 全部完成后做 `S6`，补测试并同步文档状态。
 
 ## 本周建议开工顺序
 
-1. 先收 `S1-02 ~ S1-04`
-2. 再收 `S2-01 ~ S2-03`
-3. 然后收 `S3-01 ~ S3-04`
-4. 最后再决定 `S4` 和 `S5` 是完整实现还是同步缩范围
+1. `S1` 与 `S2` 已完成口径收口，可直接进入规则侧收尾
+2. `S3-01`、`S3-02` 已完成，接下来先收 `S3-03`、`S3-04`
+3. 再决定 `S4` 和 `S5` 是完整实现还是同步缩范围
+4. 最后补 `S6-01 ~ S6-04`
 
 ## 备注
 
diff --git a/docs/MVP-Scope.md.md b/docs/MVP-Scope.md
similarity index 100%
rename from docs/MVP-Scope.md.md
rename to docs/MVP-Scope.md
diff --git a/docs/TODO.md b/docs/TODO.md
index 25b6564..82f25eb 100644
--- a/docs/TODO.md
+++ b/docs/TODO.md
@@ -9,10 +9,10 @@
 2. 每项任务必须同时满足“交付物路径”和“验收标准”才可打勾。
 3. 数据驱动优先：数值、掉落、商店、事件都优先落到 `DataTables`。
 
-## M1 当前口径（2026-03-08）
+## M1 当前口径（2026-03-09）
 
 - 当前仓库已经具备 `ProcedureMain + NodeMapForm + CombatNode + EventNode + ShopNode` 的主流程 Run 闭环，可以从主菜单进入游戏，完成固定 10 节点流程，并在 Boss 结算后进入正式结束态并回到主菜单。
-- M1 现在的真实缺口，不是“有没有 Run 雏形”，而是“节点地图表现是否收口为正式口径，以及合法出战 / 品质 / Tag / 耐久规则是否真正统一收口”。
+- `NodeMapForm` 已满足 MVP 所需的节点流程界面；M1 现在的真实缺口是合法出战 / 品质 / Tag / 耐久规则是否真正统一收口。
 - `P0-10 ~ P0-12` 在代码里都已有局部实现，因此文档里统一按“部分完成但未收口”处理；只有满足最终验收标准后才可改成完成。
 
 ## 里程碑 M1（P0）- 最小可玩闭环
@@ -23,7 +23,7 @@
 | [x] | P0-02 | 补齐数据表：组件、配件、敌人、波次、节点、事件、商店商品        | `Assets/GameMain/DataTables/*.txt`                                                     | 游戏启动可无报错加载全部新增表                                                          |
 | [x] | P0-03 | 新增/完善 DataRow 解析类                   | `Assets/GameMain/Scripts/DataTable/*.cs`                                               | 每个新增表都有对应 DR 类并成功解析                                                      |
 | [x] | P0-04 | 建立单局 Run 状态模型（金币、生命、库存、当前节点）        | `Assets/GameMain/Scripts/Procedure/`                                                   | 已有 `RunState` / 推进模型 / 固定序列 / EditMode 测试，并已接入 `ProcedureMain` 主流程闭环 |
-| [~] | P0-05 | 实现 10 节点地图生成（最后节点固定 Boss）           | `Assets/GameMain/Scripts/Procedure/`<br>`Assets/GameMain/Scripts/Scene/`               | 已有固定 10 节点序列、当前节点限制与 Boss 终点链路，但 `NodeMapForm` 表现层仍未收口为正式节点地图 |
+| [x] | P0-05 | 实现 10 节点地图生成（最后节点固定 Boss）           | `Assets/GameMain/Scripts/Procedure/`<br>`Assets/GameMain/Scripts/UI/Game/`             | 已有固定 10 节点序列、当前节点限制、Boss 终点链路与节点流程入口；MVP 不额外要求节点地图选择 UI 或表现层打磨 |
 | [x] | P0-06 | 实现节点选择与跳转流程（战斗/事件/商店）               | `Assets/GameMain/Scripts/Procedure/`                                                   | 战斗 / 事件 / 商店已统一接入节点进入、完成、异常回流；Boss 完成后会进入正式结束态并返回主菜单 |
 | [x] | P0-07 | 战斗节点基础玩法：放置塔、出怪、基地扣血、胜负判定           | `Assets/GameMain/Scripts/Entity/`<br>`Assets/GameMain/Scripts/Scene/`                  | 可完整打一场并得到胜利/失败结果                                                         |
 | [x] | P0-08 | 胜利波次与结算规则（100/80/50/<50）            | `Assets/GameMain/Scripts/Procedure/`                                                   | 结算奖励与惩罚严格匹配设计文档                                                          |
@@ -61,9 +61,9 @@
 
 ## 本周建议开工顺序
 
-1. 先把 `P0-05` 的 `NodeMapForm` 表现层从当前占位地图收口成正式节点地图
-2. 完成 `P0-10`（把“至少有参战塔”提升为“满足完整合法参战条件才能出战”）
-3. 再处理 `P0-11` ~ `P0-12`（先统一 M1 范围，再决定是完整收口还是同步缩范围）
+1. 先完成 `P0-10`（把“至少有参战塔”提升为“满足完整合法参战条件才能出战”）
+2. 再处理 `P0-11` ~ `P0-12`（先统一 M1 范围，再决定是完整收口还是同步缩范围）
+3. 最后补关键流程 / 规则回归测试，并同步文档状态
 
 ## 设计优化 Backlog（新增）