Brummel
216cc8c417
Third price-only Stage-1 R strategy: aura sweep --strategy stage1-meanrev fades deviation from a rolling mean (price above mean+k*sigma -> short, below -> long, latched +-1), feeding the unchanged bias -> RiskExecutor (vol-stop = R) -> flat-1R seam. sigma = Sqrt(Ema((price-Ema(price))^2)) reuses the vol_stop deviation- squared-then-smoothed shape, so the band is built from existing aura-std nodes (Ema/Sub/Mul/Sqrt/LinComb/Add/Gt/Latch) -> ZERO new nodes. No Delay: the current bar legitimately belongs to its own band (causal, C2). Swept knobs: --window (one Ema length ganged across mean+variance) and --band-k; downstream vol-stop R knobs unchanged. An in-file test reads the SHIPPED graph's exposure tap to pin the fade polarity (short above the band, long below) — a latch-set/reset copy-paste from breakout would invert the signal yet leave the fold-vs-raw and window-grid CLI tests green. All 588 workspace tests pass (existing R/sma/momentum/breakout goldens byte-identical); clippy clean. refs #137