Brummel
e25ca15be4
Five-task decomposition of #165 (run a serialized signal blueprint): 1. behaviour-preserving restructure of stage1_r_graph into stage1_signal() + wrap_stage1r() (the serializable signal boundary + the shared wrapping), gated by the stage1-r + bit-identical-e2e tests staying green; 2. RunManifest.topology_hash (Tier-1 optional) + thread None into the ~24 workspace literal sites (one compile-gate); 3. the shared run_signal_stage1r seam + the sha256_hex helper (sha2 in aura-cli, off the frozen engine, invariant 8) + run_stage1_r gains its topology_hash; 4. the `aura run <blueprint.json>` CLI arm (.json discriminator, --params cells), leaving the existing harness-kind dispatch intact (#159 stays); 5. demo signal blueprint + the bit-identical / determinism / E2E tests. Tasks 1-2 (restructure + field-add) run and verify first. Derived grounding decisions (the restructure target, param_space-derived manifest.params, the Q4 behaviour-preserving semantics) recorded on #165. refs #165