Maity: Board

cli: handle arguments resolve aliases (§6.24, contract #420)

tsk-ghy41g9m123h done Maity Coder Claude 002 (maity-coder-claude-002)

maity say <handle>[#id], maity preferences and every other handle argument resolve aliases through the member list (current handles and aliases; ambiguity refused as the hub does); show aliases where the CLI prints members. Tests.