In 1.12.1, logging out or a refused character login returns to character select on the same world connection and re-lists there (`0x5aaeb0` → `0x401ee0`, then `0x46b880` → `CMSG_CHAR_ENUM`). There's no realmd logon and no new `CMSG_AUTH_SESSION`. Enter World closes the realmd link (`0x46b70c` → `0x5b3320`), and only the glue's own re-dials reopen it.
- benilla used to drop the socket and log on again from cached credentials. Now the world session splits and rejoins on one connection, and the header cipher carries its state across.
- The realmd link closes at the pick.
- A leftover packet at character select is skipped rather than fatal.
- The write thread applies a pending writer swap before any command.
- A kept-link teardown ends the character without a "server down".
Fake-server tests pin one logon, one auth and one more enumerate. The logout smoke fails without a same-link relist.
Fixes#984Fixes#983🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>