fix(cli): skip OSC color queries in tmux to prevent hang on launch

[Brooooooklyn]

tmux does not reliably forward OSC color query responses back to child
processes, causing the CLI to appear stuck until a keypress is consumed
as a fake response — the same issue fixed for Warp terminal in #762.

Closes #822

Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com

---

Note

Low Risk
Low risk: adds an early-return guard in header color probing based on the TMUX env var, only affecting optional terminal color detection/formatting.

Overview
Prevents the header color-probing routine (query_terminal_colors) from sending OSC color queries when inside tmux by short-circuiting if TMUX is set, matching the existing Warp terminal workaround.

This avoids a launch-time hang where tmux may not forward OSC query responses back to the child process, at the cost of falling back to default header colors under tmux.

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[Brooooooklyn]

• fix(cli): skip OSC color queries in tmux to prevent hang on launch #945 👈 (View in Graphite)
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[fengmk2]

packages/cli/snap-tests-global/create-from-monorepo-subdir become flaky, can skip it for now.