- Create src/tui_update.rs with canonical strip_ansi() (handles CSI, OSC, DCS)
- Add DashboardUpdate struct to decouple from private LiveCli
- Remove duplicate strip_ansi_escapes from tui.rs and strip_ansi from main.rs
- update_dashboard() now delegates to tui_update::update_dashboard_from()
- 12 unit tests for ANSI stripping (CSI, OSC/BEL, OSC/ST, DCS, 256-color, RGB)
Sprint 0, Story S0-1. Pure extraction — no behavioral changes.
Authored by TheArchitectit
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