Phase 0 found that tmux pipe-pane is unreliable across alternate-screen
transitions. Before Phase 1 commits to a streaming primitive, a short
follow-up spike evaluates tmux control mode (`tmux -CC`) as an
alternative to pipe-pane + watchdog. Verdict drives T-1.1 design.
- Phase 0 status: done (GREEN LIGHT)
- Phase 1 status: ready to start
- Remove active claim for T-0.*
- Add history entry
- Full report available in feat/spike-stream branch