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CI e2e tests failed with "tmux exited with code 1: server exited unexpectedly" because the startup `start-server \; set-option -g default-terminal` call left an empty server that tmux's default `exit-empty on` killed before the first `new-session` could attach. Move the `set-option -g default-terminal tmux-256color` into the same tmux command as `new-session` (chained with `;`) so a single tmux invocation creates the server, sets the option, and spawns the pane. The pane reads `default-terminal` at creation time, so chaining before `new-session` still applies to the very first session. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>