fix

.gitignore

@@ -3,3 +3,9 @@
 web/singvis.wasm
 web/singvis.wasm.gz
 web/wasm_exec.js
+
+# wasm build scratch: patched copy of the sing module + its alternate module file
+# (see build.sh). Regenerated on demand.
+wasmbuild/.singtree/
+go.wasm.mod
+go.wasm.sum