Brummel
bd5a08d71f
Five compile-gated tasks for spec 0060: (1) additive DataSource/DataChoice provider + ns roller constants, (2) pip-parametrize the two blueprints + thread all callers, (3) thread &DataSource into the five family builders + run_sweep/ run_walkforward (dispatch passes Synthetic), (4) --real parser grammar + build-or-refuse dispatch + USAGE, (5) gated real-path integration tests + full suite + clippy. Each task threads its signature change with all callers so `cargo build -p aura-cli --all-targets` is green per task; the byte-unchanged synthetic path is the regression guard. refs #106