Phase 3f: lighting from wire normals; defuse shipped-in debug crash

Lighting: stride-8/9 vertices carry a normal (floats 3-5, uv at 6-7). The
backend transforms normals by the instance rotation and lights with a single
directional sun (GL_LIGHT0, smooth, two-sided, GL_COLOR_MATERIAL). Terrain
and hulls shade instead of reading flat.

LOD: the lod flush has no switch distances -- the host keeps the active LOD
at the child-list head and re-orders over the wire, so children[0] is right
and LOD changes come through as the sim runs.

The crash that halted the game once the RIO drove the sim was not ours: fault
at 0047E1D1 writing 0xFFFFFFFF is the RIO driver's DISABLE_AND_DIE debug
macro (PCSPAK.ASM, DIE_ON_ERROR=1), which deliberately faults on a serial-tx
anomaly -- error 3 = body char >0x7F during a RIO packet, i.e. a glitch on a
board reset. Release build (DIE_ON_ERROR=0) compiles it out and recovers
(and al,07Fh). patch_btl4opt.py NOPs all 12 sites by signature (with .orig
backup) = release behavior; game then survives RIO resets (1200+ frames).
(ALPHA_1 is git-ignored, so the tool ships, not the patched binary.)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

emulator/.gitignore

@@ -10,6 +10,7 @@ image/
 !game-mech-decoded.png
 !game-live-gl.png
 !game-live-textured.png
+!game-live-lit.png
 dbx_out.txt
 vpx*.txt
 sweep_*.txt