Phase 6: Fix swallowed exceptions and cleanup unused usings

- Add debug logging to all empty catch blocks in DecalHarmonyClean.cs setup methods
  (prefix method catches intentionally stay silent to never break other plugins)
- Add error logging to VtankControl.VtSetSetting catch
- Add logging to DecalPatchMethods.ProcessInterceptedMessage catch
- Remove unused usings from PluginCore.cs (System.Diagnostics, System.Drawing,
  System.Text, System.Text.RegularExpressions)
- Flatten redundant nested try/catch in PatchPluginHost

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

MosswartMassacre/DecalHarmonyClean.cs

@@ -62,9 +62,9 @@ namespace MosswartMassacre
                 // PATHWAY 2: Target Host.Actions.AddChatText (what our plugin uses)
                 PatchHostActions();
             }
-            catch
+            catch (Exception ex)
             {
-                // Only log if completely unable to apply any patches
+                AddDebugLog($"ApplyDecalPatches failed: {ex.Message}");
             }
         }
 
@@ -92,13 +92,15 @@ namespace MosswartMassacre
                     {
                         ApplySinglePatch(method, prefixMethodName);
                     }
-                    catch
+                    catch (Exception ex)
                     {
+                        AddDebugLog($"PatchHooksWrapper single patch failed ({prefixMethodName}): {ex.Message}");
                     }
                 }
             }
-            catch
+            catch (Exception ex)
             {
+                AddDebugLog($"PatchHooksWrapper failed: {ex.Message}");
             }
         }
 
@@ -139,16 +141,18 @@ namespace MosswartMassacre
                     {
                         ApplySinglePatch(method, prefixMethodName);
                     }
-                    catch
+                    catch (Exception ex)
                     {
+                        AddDebugLog($"PatchHostActions single patch failed ({prefixMethodName}): {ex.Message}");
                     }
                 }
 
                 // PATHWAY 3: Try to patch at PluginHost level
                 PatchPluginHost();
             }
-            catch
+            catch (Exception ex)
             {
+                AddDebugLog($"PatchHostActions failed: {ex.Message}");
             }
         }
 
@@ -157,9 +161,6 @@ namespace MosswartMassacre
         /// </summary>
         private static void PatchPluginHost()
         {
-            try
-            {
-                // Try to patch CoreManager.Current.Actions if it's different
             try
             {
                 var coreActions = CoreManager.Current?.Actions;
@@ -177,18 +178,16 @@ namespace MosswartMassacre
                             string prefixMethodName = "AddChatTextPrefixCore" + parameters.Length;
                             ApplySinglePatch(method, prefixMethodName);
                         }
-                            catch
+                        catch (Exception ex)
                         {
+                            AddDebugLog($"PatchPluginHost single patch failed: {ex.Message}");
                         }
                     }
                 }
             }
-                catch
-                {
-                }
-            }
-            catch
+            catch (Exception ex)
             {
+                AddDebugLog($"PatchPluginHost failed: {ex.Message}");
             }
         }
 
@@ -210,8 +209,9 @@ namespace MosswartMassacre
                     patchesApplied = true;
                 }
             }
-            catch
+            catch (Exception ex)
             {
+                AddDebugLog($"ApplySinglePatch failed ({prefixMethodName}): {ex.Message}");
             }
         }
 
@@ -244,8 +244,9 @@ namespace MosswartMassacre
                 }
                 patchesApplied = false;
             }
-            catch
+            catch (Exception ex)
             {
+                AddDebugLog($"Cleanup failed: {ex.Message}");
             }
         }
 
@@ -390,8 +391,9 @@ namespace MosswartMassacre
                     Task.Run(() => WebSocket.SendChatTextAsync(color, text));
                 }
             }
-            catch
+            catch (Exception ex)
             {
+                DecalHarmonyClean.AddDebugLog($"ProcessInterceptedMessage failed: {ex.Message}");
             }
         }
 

MosswartMassacre/PluginCore.cs

@@ -1,13 +1,9 @@
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
-using System.Drawing;
 using System.Globalization;
 using System.Linq;
 using System.Net;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using System.Timers;
 using Decal.Adapter;

MosswartMassacre/VtankControl.cs

@@ -72,9 +72,9 @@ namespace MosswartMassacre
                     return 0;
                 }
             }
-            catch
+            catch (Exception ex)
             {
-                // Swallow any errors and signal failure
+                PluginCore.WriteToChat($"[VTank] SetSetting error ({setting}): {ex.Message}");
                 return 0;
             }