refactor(registry): single-source the deflation-bootstrap constants (#199)

DEFLATION_N_RESAMPLES (1000) and DEFLATION_BLOCK_LEN (5) were duplicated
as independent copies in aura-cli and aura-campaign — a silent-drift risk
(an edit in one crate but not the other refuses nothing, it just produces
a wrong deflation result). Promote a single definition into aura-registry,
which owns optimize_deflated (the sole consumer of these counts); aura-cli
imports it and aura-campaign re-exports it to keep its public path stable.
DEFLATION_SEED stays cli-local (no campaign twin). Values unchanged;
behaviour-preserving, suite green unchanged (1043/0).

closes #199

crates/aura-registry/src/lib.rs

@@ -595,6 +595,13 @@ pub fn optimize_plateau(
     ))
 }
 
+/// Deflation-bootstrap default: the resample count of the null-distribution
+/// bootstrap consumed by [`optimize_deflated`].
+pub const DEFLATION_N_RESAMPLES: usize = 1000;
+/// Deflation-bootstrap default: the moving-block length of the null-distribution
+/// bootstrap consumed by [`optimize_deflated`].
+pub const DEFLATION_BLOCK_LEN: usize = 5;
+
 /// `optimize`'s argmax winner PLUS its trials-deflation provenance. The returned
 /// `SweepPoint` is byte-identical to `optimize(family, metric)` (additive, C23).
 /// R arm: a centred moving-block reality-check (`overfit_probability` =