feat: Add Click-based CLI for launching BCASL Studio with standalone option

Author: PyCompiler ARK++

main.py

@@ -451,7 +451,41 @@ def _launch_main():
         return 1
 
 
+# Click-based CLI to allow launching BCASL-only Studio from the root entry
+try:
+    import click
+
+    @click.group(invoke_without_command=True, context_settings={"help_option_names": ["-h", "--help"]})
+    @click.option("--bcasl-only", is_flag=True, help="Launch BCASL Studio (Standalone)")
+    @click.pass_context
+    def cli(ctx: click.Context, bcasl_only: bool):
+        """PyCompiler ARK++ CLI."""
+        if ctx.invoked_subcommand is None:
+            if bcasl_only:
+                from bcasl.only_mod.app import run as run_bcasl
+                rc = run_bcasl(sys.argv)
+                raise SystemExit(rc)
+            else:
+                rc = main(sys.argv)
+                raise SystemExit(rc)
+
+    @cli.command(name="bcasl")
+    def cli_bcasl():
+        """Launch BCASL Studio (Standalone)."""
+        from bcasl.only_mod.app import run as run_bcasl
+        rc = run_bcasl(sys.argv)
+        raise SystemExit(rc)
+
+except Exception:
+    # Fallback CLI if click isn't available
+    def cli():  # type: ignore
+        if any(arg in ("--bcasl-only", "bcasl") for arg in sys.argv[1:]):
+            from bcasl.only_mod.app import run as run_bcasl
+            rc = run_bcasl(sys.argv)
+            raise SystemExit(rc)
+        rc = main(sys.argv)
+        raise SystemExit(rc)
+
+
 if __name__ == "__main__":
-    import multiprocessing
-    multiprocessing.set_start_method("spawn", force=True)
-    sys.exit(main(sys.argv))
+    cli()