A third price-only Stage-1 R candidate: an EWMA Bollinger-band mean-reversion
fade (price vs rolling mean +/- k*sigma, latched +-1, sign inverted vs breakout).
Composed entirely from existing aura-std primitives (the vol_stop sigma pattern)
-> zero new nodes. Screens the mean-reversion hypothesis under the same #137
lie-detector bar after the two trend candidates (momentum, breakout) were
refuted. Grounding-check PASS (9/9 load-bearing assumptions ratified).
refs #137
Brummel
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