chore: point to toolset migration

.zig-cache/have-help.out

@@ -0,0 +1,12 @@
+usage: have [NAME...]
+
+List executable command names found in PATH, one per line.
+With NAME args, print the names that are available and exit 1 if any are missing.
+This inspects PATH only; it does not know shell builtins, aliases, functions, or packages.
+
+stdout:
+  one command name per line
+
+examples:
+  have | grep '^zig$'
+  have zig git curl