checkpoint: VT1200 reverse-engineering workspace before board-model work

.gitignore

@@ -0,0 +1,35 @@
+# Generated emulator artifacts — never commit
+harness/mame/out.avi
+harness/mame/*.ppm
+harness/mame/*.pgm
+harness/mame/vt1200-ram-*.bin
+harness/mame/vt1200-frame-*.ppm
+harness/mame/hist.txt
+harness/mame/debug.log
+harness/mame/build.log
+harness/mame/mpv.log
+harness/mame/loupe.log
+harness/mame/error.log
+harness/mame/trace/*.trace*
+
+# Crash dumps
+core
+core.*
+*.core
+
+# Python
+__pycache__/
+*.pyc
+
+# Emulator + tooling scratch
+.superpowers/
+ghidra/vt1200.rep/
+*.gpr
+
+# Nested clone (re-clonable; our patches live in git-tracked files)
+lat/code/latd/
+
+# Large generated trace + nested reference clones
+harness/mame/vt1200-reset.trace
+reference/x11/
+tools/ghidra-headless-mcp/