Modeled on nostrcli.sh's docs page: quick start, seven worked examples
(post a note, send a DM, read a thread, view a profile, MLS group
round-trip, account switching, add a relay), categorised command
reference, output-modes section, multi-account workflow, agent/script
recipes, troubleshooting.
README.md and DEVELOPMENT.md are referenced from here; they stay
focused on the public contract and the extension rules.
