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).

Generated with https://github.com/Yeachan-Heo/gajae-code
Co-authored-by: Gajae Code <dev@gajae-code.com>

Author: 2 people