folds/in_sample_bars/out_of_sample_bars mapped to nothing
WindowRoller::new accepts; the block now carries in_sample_ms/
out_of_sample_ms/step_ms/mode (WfMode: rolling|anchored) — the
roller's three lengths in the campaign window's own epoch-ms unit
plus both shipped RollModes (#198 decision 2). New intrinsic fault
ZeroWalkForwardLength (path-addressed) refuses zero lengths at the
doc tier, earlier than the roller's NonPositiveLength. Golden
canonical pin, PROCESS_FIXTURE, introspection tables, and the
aura-cli prose/fixture twins moved together; fieldtest corpus
untouched (historical record — stored walk_forward docs get new
content ids by design).
Gates: aura-research 14/14, aura-cli green, workspace build clean.
refs #198
Brummel
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