walkforward_stopless_defaults_the_regime_byte_identically_to_explicit_3_2
pins the decided contract (#217 decision comment, 2026-07-09): a
walkforward invocation without --stop-length/--stop-k succeeds, each
omitted knob defaulting to the single-sourced regime (length 3, k 2.0),
and produces a campaign document content-identical to the explicit
--stop-length 3 --stop-k 2.0 spelling (registry dedup: exactly one doc).
Currently RED: the verb refuses with the requires-knobs usage error.
refs #217
Brummel
af8564d20b