4f88d67543
The Donchian channel-breakout Stage-1 R candidate is refuted: no cross-index generalization, violent IS->OOS sign flips at long channels, no significant positive cell (full verdict recorded on #137). The breakout machinery (RollingMax / RollingMin nodes, --strategy stage1-breakout) is permanent and kept; only the per-cycle spec/plan are dropped per the ephemeral-artifact lifecycle convention. refs #137