fix: add list to KNOWN_SUBCOMMANDS and close ROADMAP 454-455

Added list to KNOWN_SUBCOMMANDS so claw list is caught by typo
suggestion instead of falling through to CliAction::Prompt. Also
verified #455 (missing_credentials hint already newline-delimited).

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

@@ -2671,6 +2671,7 @@ fn suggest_similar_subcommand(input: &str) -> Option<Vec<String>> {
         "init",
         "export",
         "prompt",
+        "list",
     ];
 
     let normalized_input = input.to_ascii_lowercase();