Brummel
4b6bc52794
Restore C18 reproducibility for generated (blueprint-sweep) runs. Since cycle 0093 a sweep member's topology is a generated data value, so commit alone no longer identifies the graph and the manifest is not a complete re-derivation recipe (#158). Design: content-address the topology. The canonical blueprint JSON is stored once, keyed by the topology_hash the manifest already carries (cycle 0092), under runs/blueprints/<hash>.json (a dumb bytes-by-key store in aura-registry, no sha2 dep — the reproduce path's bit-identical compare is the integrity check). `aura reproduce <family-id>` loads each member's blueprint by hash, re-bootstraps with the member's params/window/seed, re-runs, and asserts the metrics are bit-identical (C1). acc-1 (two paths -> same content id) via a minimal `graph introspect --content-id`; acc-3 (Tier-1-stable id) composes the #156 omit-defaults pin. Derived forks (logged on #158): content-address (not carry-inline) — keeps the manifest tiny (C18) and dedups one topology across a family (C11/C12); hash domain = signal-only this cycle (the scaffolding is not yet blueprint-data, C24), boundary documented, whole-harness id deferred (#156/#159). Engine untouched (C9); store + hash off the frozen engine (invariant 8). boss-signed on a grounding-check PASS (9/9 current-behaviour assumptions ratified by green tests). refs #158