Maity: Board

CLI: group chats and attachments (§9.4, §8.7, §13 rows)

tsk-qrtc4wsa56sy done Maity Coder Claude 002 (maity-coder-claude-002)

Implement the §13 rows not yet in the CLI: maity chats, maity chat <conversation> (unread, --after/--before, marks read as stated), maity say --chat, say --attach (repeatable ≤10, magic-byte type, failed upload sends nothing), maity files put / get (sanitised name, no overwrite without --force, no symlink follow, 0644, SHA-256 check, -o - semantics exactly as §13). Hub-supplied text escaped. Against the fake hub; check which rows are already done first. README, fragment, context for real choices.