ROM import tables

One file per ROM revision. Addresses are bit addresses and are not assumed stable across firmware revisions; v2.2 is the first target.

vt1200-v22.syms contains only the entries already proven by the hand-written payloads in vendor/vt1200/dwt/gui/xhello.asm and the README. The compiler milestone that first calls Xlib must extend it from the Ghidra project / ptr_constants.py and validate each entry on MAME, then on the real unit.

The build resolves these as absolute symbols (or ABI-preserving stubs). Do not bake them into the compiler: keep them in a per-ROM linker script.