Give the Refuse effect its wire verdict: its text travels as SetStatus

gh/main's vocabulary_is_complete requires every effect to be on the wire or
named with a verdict. Refuse's portable half is its status text; the flag is
one host batch's outcome (context/code/cli.md §10).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze

crates/improvise-command/src/ui/reduce/vocabulary_is_complete.rs

@@ -26,6 +26,8 @@ const NOT_ON_THE_WIRE: &[(&str, Verdict)] = &[
     ("HelpPageNext", Verdict::Command("HelpPage")),
     ("HelpPagePrev", Verdict::Command("HelpPage")),
     ("HelpPageSet", Verdict::Command("HelpPage")),
+    // Its text; the refusal flag is one host batch's outcome (context/code/cli.md §10).
+    ("Refuse", Verdict::Command("SetStatus")),
     ("Save", Verdict::Frame("Save")),
     (
         "SaveAs",