fix(run): remove spinner dependency from runtime output

- decouple spinner from output rendering
- fix captureOnly logic blocking stdout when spinner is disabled
- ensure live output is always displayed for vix run
- remove 'Running script' label for cleaner CLI UX

behavior now matches modern runtimes (go, deno, node)

Author: GaspardKirira

src/commands/run/RunProcess.cpp

@@ -768,7 +768,7 @@ namespace vix::commands::RunCommand::detail
     ::setpgid(pid, pid);
 
     const bool useSpinner = !spinnerLabel.empty();
-    const bool captureOnly = (!passthroughRuntime && spinnerLabel.empty());
+    const bool captureOnly = false;
     bool spinnerActive = useSpinner;
     std::size_t frameIndex = 0;
 

src/commands/run/RunScript.cpp

@@ -643,7 +643,7 @@ namespace vix::commands::RunCommand::detail
 
     auto rr = run_cmd_live_filtered_capture(
         cmdRun,
-        runLabel,
+        "",
         /*passthroughRuntime=*/isPlainScript,
         /*timeoutSec=*/effective_timeout_sec(opt));