Add tools/vergilius_to_rcx.py: scrapes struct definitions from
vergiliusproject.com and generates .rcx JSON files. Supports bitfields,
arrays, self-referential pointers, deep union/struct nesting, and
cross-struct references. Offsets correctly stored as parent-relative.
Add src/examples/Vergilius_25H2.rcx: 1,690 kernel structs (18,924 nodes)
from Windows 11 25H2 including _EPROCESS, _KTHREAD, _MMPFN, _PEB, etc.
Remove orange M_CYCLE background on self-referential pointer children —
rows now render with normal theme background while retaining click-to-
materialize behavior.
