docs(posts): describe CI Fiber M50 as Table In, the pallet swap

The pallet-change setting and post doc said M50 moves the cut sheet out,
borrowed from the CL-series manual. Cincinnati's CNC Codes Handbook calls
M50 "Table In" and M51 "Table Out". On the CI Fiber shuttle, Table In brings
the waiting pallet into the laser, which sends the cut one out, so M50 is
still the swap. Say that, note that it expects the waiting pallet to be
loaded, and note that newer Cincinnati samples end without a pallet code.
Default (M50) and posted output are unchanged.

Posts/OpenNest.Posts.CincinnatiCIFiber/CIFiberPostConfig.cs

@@ -114,15 +114,17 @@ namespace OpenNest.Posts.CincinnatiCIFiber
 
         /// <summary>
         /// Line written to swap pallets: after the last sheet, and between sheets
-        /// 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.
+        /// in a single program. Cincinnati's CNC Codes Handbook calls M50 "Table In":
+        /// the waiting pallet moves into the laser, which sends the cut pallet out
+        /// for unloading (machine sample tail; reading confirmed by the machine
+        /// owner). It expects the waiting pallet to be loaded. M51 ("Table Out")
+        /// only sends the pallet out. Blank writes no pallet change.
         /// </summary>
         [DisplayName("Pallet change code")]
         [Description(
-            "Written after each sheet to swap pallets, moving the cut sheet out for unloading. "
-                + "Cincinnati uses M50. Blank writes no pallet change."
+            "Written after each sheet to swap pallets. Cincinnati's M50 (Table In) brings the "
+                + "waiting pallet into the laser and sends the cut sheet out, so load the waiting "
+                + "pallet first. Blank writes no pallet change."
         )]
         [PostSetting(SheetsSection, 1)]
         public string PalletChangeCode { get; set; } = "M50";

docs/cincinnati-ci-fiber-post-output.md

@@ -81,10 +81,14 @@ validated and saved only when OK is pressed.
   change separate sheets, and the header carries the first sheet's size. Sheets
   of different sizes are rejected in this mode. Posting to a stream always
   produces one program, so it rejects a multi-sheet nest in per-sheet mode.
-- `PalletChangeCode` defaults to `M50`, the Cincinnati pallet change: the machine
-  sample ends `L PROGRAMEND.NC`, `M50`, `M30`, moving the cut sheet out for
-  unloading before the program ends (CL-series manual EM-423 §3.50; confirmed by
-  the machine owner).
+- `PalletChangeCode` defaults to `M50`, as in the machine sample, which ends
+  `L PROGRAMEND.NC`, `M50`, `M30`. Cincinnati's CNC Codes Handbook calls M50
+  "Table In" and M51 "Table Out". On the CI Fiber the head stays at a fixed height
+  and the pallets shuffle and lift to swap. Table In moves the waiting pallet into
+  the laser, which sends the cut pallet out for unloading, so M50 is the swap
+  (reading confirmed by the machine owner). It expects the waiting pallet to be
+  loaded. Newer Cincinnati samples end with `M30` and no pallet code; clear
+  the setting to match.
 - **Release blocker:** the single-program sequence between sheets (`/L "L0"`, then
   `M50`, then the next sheet with no new header or start macro) is inferred, not
   observed. Confirm it against a Cincinnati multi-sheet sample before release, or