Insert mode bound `esc` to LeaveInsert, so full-screen apps in a session
(vim, Claude Code) never saw Escape — the only way out of Insert is now
the leader, which rebinding still follows.
A key bound to `Noop` in Insert mode is also forwarded to the pty now.
`Noop` documents itself as the way to suppress a default binding, and in
Insert mode an unbound key belongs to the session, so this is the escape
hatch for taking any other default back.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
