* CLI: clarify config vs configure descriptions
* CLI: improve top-level command descriptions
* CLI: make direct command help more descriptive
* CLI: add commands hint to root help
* CLI: show root help hint in implicit help output
* CLI: add help example for command-specific help
* CLI: tweak root subcommand marker spacing
* CLI: mark clawbot as subcommand root in help
* CLI: derive subcommand markers from registry metadata
* CLI: escape help regex CLI name
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