The MC half of #170 (World/C21): aura mc <closed blueprint.json> --seeds N
builds a FamilyKind::MonteCarlo family from a loaded closed blueprint, each
seed drawing a distinct synthetic price walk (the mc_family pattern), sharing
one topology_hash, written once to the content-addressed store (the 0094 hook)
so aura reproduce re-derives it bit-identically.
Scope narrowed from #170's two verbs by two read-only review gates:
- spec-skeptic: a loaded-blueprint 'walkforward' with no in-sample refit under
the verb name that hard-wired walkforward uses for real IS-optimization is a
guarantee collision -> walk-forward deferred to #173 (deps #169 axis-discovery).
- grounding-check: there is no per-knob declared-default mechanism and the raw
bind path panics on arity mismatch -> MC runs a CLOSED blueprint over the empty
point (as aura run does), rejecting an open blueprint with a named error + exit 2.
Grounding-check PASS on the revised spec; decisions logged on #170.
refs #170
Brummel
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