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
Brummel
e25ca15be4