feat(ghidra): admit explicit DOS COM analysis (#702)

* feat(ghidra): admit explicit DOS COM analysis

Carry caller-selected COM interpretation through CLI, MCP and target
identity, seed real-mode entry/context before Ghidra analysis, and verify
complete loaded bytes, source mappings and measured register context.
Keep original binaries unchanged and PSP/runtime coverage explicit.

Assisted-by: Nitori (gensokyo-skills:nitori-reverse-engineering)

* fix(verification): validate COM package selection before allocating fixtures

src/domain/binaryTargetTypes.ts

@@ -26,7 +26,7 @@ type ExecutableTarget = BinaryTargetIdentity & {
  */
 export type BinaryTarget =
   | (ExecutableTarget & {
-      readonly format: "mach-o" | "elf" | "dos-mz";
+      readonly format: "mach-o" | "elf" | "dos-mz" | "dos-com";
       readonly executableRole?: never;
       readonly managed?: never;
     })