Cleaning up repo.

.gitignore

@@ -5,15 +5,32 @@ tools/
 # Claude Code tool state
 .claude/
 
-# Runtime build artifacts: regenerable via runtime/build.sh from
-# runtime/src/*.s.  The source files (.s, build.sh) are tracked.
-runtime/*.o
-runtime/*.o.bak
-runtime/*.o.tmp
+# Build artifacts — regenerable from source via runtime/build.sh,
+# demos/build.sh, demos/buildGno.sh, compare/regen.sh, etc.  These
+# extensions are never source in this tree: compiled objects, flat
+# binaries, OMF images, linker maps, and reloc sidecars.  Hand-written
+# assembly (runtime/src/*.s, src/llvm/test/**/*.s) keeps the .s extension
+# and stays tracked, so *.s is deliberately NOT ignored.
+*.o
+*.o.bak
+*.o.tmp
+*.bin
+*.omf
+*.map
+*.reloc
 
-# Per-test build outputs.
+# Per-target build directories.
 tests/coremark/build/
-tests/coremark/coreMark.bin
+tests/lua/build/
+
+# compare/ regenerables (compare/regen.sh): our backend asm output and
+# the Calypsi reference listings.  Scoped so they can't catch source .s.
+compare/*.ours.s
+compare/*.calypsi.lst
+
+# Stray Calypsi-generated asm at the repo root (not hand-written source).
+# Root-anchored so it can't catch a real source file elsewhere.
+/bench_simple.s
 
 # Editor / OS
 *.swp