Brummel
2a6ca47acd
Plan 0060 Tasks 2-3 (#106): the family builders now take a &DataSource and draw their source, pip, window, and walk-forward roller sizes from it instead of the hardcoded synthetic VecSource / SYNTHETIC_PIP_SIZE. - sample_blueprint_with_sinks / momentum_blueprint_with_sinks take a pip_size (un-hardcode the SimBroker); every caller threads it. - sweep_family / momentum_sweep_family / walkforward_family / sweep_over / run_oos take &DataSource; run_sweep / run_walkforward take a DataSource and the dispatch passes DataSource::Synthetic (the --real parser is the next step). Synthetic behaviour is byte-unchanged. - Fix a design gap the implementer correctly bounced on: walk-forward is a windowed consumer whose span comes from the 60-bar walkforward_prices, NOT the 18-bar showcase that full_window() returns. Added DataSource::wf_full_span() (synthetic walk-forward span; real = the probed --from..--to) and pointed walkforward_family at it. Without it the synthetic roller (24,12,12) over span (1,18) exits SpanTooShort. Verified: cargo test -p aura-cli (all green, synthetic byte-unchanged), cargo clippy -p aura-cli --all-targets -D warnings (clean). refs #106