M5: moderation, permissions, channel CRUD, in-app account management
- Server-side moderation & permissions (kick/ban/move/server-mute, channel CRUD).
- Database schema v2: channels, bans; BLAKE2b channel passwords, Argon2id accounts.
- C ABI additions and client-side handling (vc_kick_user, vc_ban_user, vc_set_permission, vc_set_server_mute, vc_move_user, vc_create/edit/delete_channel, vc_create/reset/delete/list_account).
- vccli flags for all M5 operations plus --username/--password auth.
- Four new tests covering permissions, kick/ban/move/mute, admin accounts, channel CRUD.
- Docs: protocol.md envelope updates, security.md channel-password hashing, PROGRESS.md.
Talon
3990f63f0f