Add sandbox CLI and integrate with TUI#119

Draft

andyrewlee wants to merge 12 commits intomainfrom

Commits on Mar 2, 2026

Fix sandbox sync safety and CLI dispatch compatibility
andyrewlee
committed
Fix sandbox rollback races and cloud terminal reattach semantics
andyrewlee
committed

Commits on Mar 8, 2026

Fix sandbox diagnostics/session error regressions
andyrewlee
committed

Commits on Mar 11, 2026

Fix sandbox auth and SSH debug handling
andyrewlee
committed

Commits on Mar 20, 2026

Handle workspace rebinds across sandbox and tmux sessions
andyrewlee
committed

Commits on Mar 28, 2026

Fix sandbox CLI workspace and settings regressions
andyrewlee
committed

Commits on Apr 8, 2026

Fix doctor logs fallback behavior
andyrewlee
committed