Donchian channel-breakout as the next Stage-1 R research candidate, after the
SMA-momentum family was refuted (cross-index non-generalization + no within-symbol
significance; #137/#141). Swaps only the signal leg of stage1_r_graph:
close -> Delay(1) -> {RollingMax,RollingMin}(N) -> {Gt,Gt} -> {Latch,Latch} ->
Sub = bias in {-1,0,+1}; the vol-stop defines R unchanged (clean A/B vs momentum).
Two new aura-std nodes (RollingMax/RollingMin, monotonic-deque sliding extremum);
the +/-1 direction latch composes from two existing Latch nodes + Sub. New
--strategy stage1-breakout + --channel grid flag; the family iterates the grid
with fully-bound graphs (compile_with_params(&[]) + Harness::bootstrap), sidestepping
parameter-ganging. Delay(1) is the C2 causality guard (channel excludes current bar).
Grounding-check PASS: all 10 load-bearing assumptions ratified by named green tests.
Auto-signed under /boss (grounding-check PASS = the signature).
refs #137
Brummel
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