fix: module syntax — changed src_bux/*.bux from module X; to module X { ... }

src_bux/cli.bux

@@ -1,6 +1,6 @@
 // cli.bux — CLI driver for the Bux self-hosting compiler
 // Wires together: Lexer → Parser → Sema → HirLower → CBackend
-module Cli;
+module Cli {
 
 extern func PrintLine(s: String);
 extern func Print(s: String);
@@ -164,4 +164,4 @@ func Cli_Run(args: *String, argCount: int) -> int {
     Print("Unknown command: ");
     PrintLine(cmd);
     return 1;
-}
+}