Sync a few notes from Serialization

SabreTools.Models/PortableExecutable/Constants.cs

@@ -4,6 +4,7 @@ namespace SabreTools.Models.PortableExecutable
     // - COFF File Header size is a constant value of 20 (0x14)
     // - Section Header size is a constant value of 40 (0x28)
     // - COFF Symbol Table entry size is a constant value of 18 (0x12)
+    // - Debug Directory entry size is a constant value of 28 (0x1C)
     public static class Constants
     {
         public static readonly byte[] SignatureBytes = [0x50, 0x45, 0x00, 0x00];

SabreTools.Models/PortableExecutable/Enums.cs

@@ -494,9 +494,17 @@ namespace SabreTools.Models.PortableExecutable
     public enum ExtendedDllCharacteristics : ushort
     {
         /// <summary>
-        /// Image is CET compatible.
+        /// Image is Control-flow Enforcement Technology (CET) Shadow Stack compatible
         /// </summary>
         IMAGE_DLLCHARACTERISTICS_EX_CET_COMPAT = 0x0001,
+
+        /// <summary>
+        /// All branch targets in all image code sections are annotated with forward-edge
+        /// control flow integrity guard instructions such as x86 CET-Indirect Branch
+        /// Tracking (IBT) or ARM Branch Target Identification (BTI) instructions.
+        /// This bit is not used by Windows.
+        /// </summary>
+        IMAGE_DLLCHARACTERISTICS_EX_FORWARD_CFI_COMPAT = 0x0040,
     }
 
     [Flags]

SabreTools.Models/PortableExecutable/ExportTable.cs

@@ -15,6 +15,13 @@
     /// <see href="https://learn.microsoft.com/en-us/windows/win32/debug/pe-format"/>
     public sealed class ExportTable
     {
+        // TODO: Look into splitting this up
+        // Technically speaking, even though all of these should live in the same
+        // section, there is nothing in the spec that guarantees that they are together
+        // outside of the obvious logical grouping. The directory table is more obviously
+        // directly a part of the executable, while the other 4 structures are all based
+        // on information from that one-row table.
+
         /// <summary>
         /// A table with just one row (unlike the debug directory). This table indicates the
         /// locations and sizes of the other export tables.