Recipe Defaults

Cycle 10 source of truth for user-facing defaults is macroforecast.defaults.

Public defaults:

Constant	Value
DEFAULT_RANDOM_SEED	42
DEFAULT_MODEL_FAMILY	"ar_p"
DEFAULT_HORIZONS	(1,)
DEFAULT_FORECAST_STRATEGY	"direct"
DEFAULT_TRAINING_START_RULE	"expanding"
DEFAULT_REFIT_POLICY	"every_origin"

Docs should not teach random_seed: 0, model_family: "ar", or legacy default-profile grammar.

build_default_recipe_dict() (Cycle 11b1 fix) emits a recipe using the current top-level layer keys and the constants above.