Relay v0.23.0

Features

• engine: close the whole POSIX session when a tab closes
• app: hang up every live session on quit
• engine: close pty sessions left behind by a quit or a crash

Fixes

• agents: keep the event socket out of the shells

Other

• record that the 0.23.0 ships Cycle 29
• record Cycle 29, the sessions that outlived a quit or a crash
• record Cycle 28, the chat title as a naming signal

Full Changelog: v0.22.0...v0.23.0