Design-only doc covering the networking subsystem needed to bring
the static Holtburg scene online: UDP packet codec, ISAAC keystream,
fragment reassembly, GameMessage dispatch, WorldSession lifecycle,
and composite IGameState so server CreateObject messages flow through
the same IEvents pipeline the dat-hydrated static entities already use.
Also documents that ACE is the authority for the protocol (neither
WorldBuilder nor ACViewer implements client networking) and captures
the license hygiene plan: read ACE's AGPL source for protocol knowledge,
reimplement from scratch, credit in NOTICE.md.
Explicit win condition for Phase 4: the foundry statue finally appears,
because it's a server weenie, not a dat decoration.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
