Extract cmdLusers, cmdMode, cmdMotd, cmdNames, cmdNotice, cmdPing, cmdPong
constants in internal/handlers/api.go. Add corresponding constants in
cmd/neoirc-cli/main.go and cmd/neoirc-cli/api/client.go. Replace every bare
IRC command string literal in switch cases and command dispatch code with the
named constant. Zero bare command strings remain in any dispatch path.
clawbot