fix: widen parse_subcommand guard for multi-word commands

Changed rest.len() != 1 guard to rest.is_empty() so claw cost list,
claw model list, claw permissions show, etc. now reach the
bare_slash_command_guidance guard and emit typed slash-command
guidance instead of falling through to CliAction::Prompt.

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Co-authored-by: Gajae Code <dev@gajae-code.com>

rust/crates/rusty-claude-cli/src/main.rs

@@ -2350,7 +2350,8 @@ fn parse_single_word_command_alias(
         return Some(Ok(CliAction::Help { output_format }));
     }
 
-    if rest.len() != 1 {
+    // #453: fire guard for multi-word commands too (claw cost list, claw model list, etc.)
+    if rest.is_empty() {
         return None;
     }