docs(posts): record M50 as the confirmed CI Fiber pallet change

The machine owner confirmed M50 swaps pallets (the sample's M50 before
M30 moves the cut sheet out for unloading). Only the single-program
between-sheet sequence remains unconfirmed.

Posts/OpenNest.Posts.CincinnatiCIFiber/CIFiberPostConfig.cs

@@ -114,14 +114,15 @@ namespace OpenNest.Posts.CincinnatiCIFiber
 
         /// <summary>
         /// Line written to swap pallets: after the last sheet, and between sheets
-        /// in a single program. M50 comes from the machine sample and the CL-series
-        /// manual (EM-423 §3.50); it is unconfirmed for multi-sheet CI Fiber runs.
-        /// Blank writes no pallet change.
+        /// in a single program. M50 is the Cincinnati pallet change (machine sample
+        /// tail, CL-series manual EM-423 §3.50; confirmed by the machine owner): it
+        /// moves the cut sheet out for unloading before M30. Blank writes no pallet
+        /// change.
         /// </summary>
         [DisplayName("Pallet change code")]
         [Description(
-            "Written after each sheet to swap pallets. M50 matches the machine sample; "
-                + "confirm it for multi-sheet runs. Blank writes no pallet change."
+            "Written after each sheet to swap pallets, moving the cut sheet out for unloading. "
+                + "Cincinnati uses M50. Blank writes no pallet change."
         )]
         [PostSetting(SheetsSection, 1)]
         public string PalletChangeCode { get; set; } = "M50";