Introduce a dedicated module that builds the two-window tmux layout team-mode relies on:
- "focus" window uses main-vertical for the lead-centric view
- "grid" window uses tiled so every member pane is visible at once
createTeamLayout spawns omo-team-<teamRunId>, registers pane titles with
color-coded labels, and returns the focus/grid window IDs plus a
pane-by-member map. removeTeamLayout tears the session down idempotently.
canVisualize short-circuits when TMUX is unset so callers degrade
gracefully outside a tmux context.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
YeonGyu-Kim