gitignore: ignore root RAM dumps (ROM stays tracked) and the Ghidra transient lock; untrack the lock file

.gitignore

@@ -52,3 +52,9 @@ harness/mame/cfg-net/
 # Test frame dumps written into the project root (the harness ignores them under harness/mame/)
 /*.ppm
 /*.pgm
+
+# RAM dumps written into the root (never the ROM: vt1200_v22.bin is tracked)
+/vt1200-ram-*.bin
+
+# Ghidra transient lock file (the project data directory is ignored separately)
+ghidra/vt1200.lock

ghidra/vt1200.lock

@@ -1,9 +0,0 @@
-#Ghidra Lock File
-#Fri Oct 16 10:54:50 EEST 2026
-<META>\ Supports\ File\ Channel\ Locking=Channel Lock
-Hostname=sid
-OS\ Architecture=amd64
-OS\ Name=Linux
-OS\ Version=7.2.4-arch1-2
-Timestamp=10/16/26, 10\:54\u202FAM
-Username=arti