feat(0092): run-from-blueprint infrastructure — restructure + topology_hash + shared seam (Tasks 1-3)

Cycle-1 infrastructure for #165 (World/C21). Behaviour-preserving + workspace
green; the CLI arm + tests (Tasks 4-5) follow.

Task 1 — restructured stage1_r_graph into stage1_signal() (the serializable
signal leg: SMA-cross -> Bias, a `price` input-role + a `bias` output) +
wrap_stage1r(signal, ...) (broker/sinks/exec/cost around a nested signal), with
stage1_r_graph() = wrap_stage1r(stage1_signal(...)). DEVIATION from the plan's
"callers untouched" claim, verified behaviour-preserving: nesting the signal
prefixes its param-space names (stage1_signal.fast.length), which broke the
sweep's bare .axis("fast.length"); fixed exactly as the #137 stop-knob machinery
does — FAST_LENGTH_SUFFIX/SLOW_LENGTH_SUFFIX suffix-resolution + stage1_r_friendly_name
arms mapping the prefixed names back to the bare manifest names. All observable
behaviour (manifest names, member keys, metrics, traces) byte-identical; the flat
graph and every metric unchanged (full suite green, incl. sweep/walkforward/MC).

Task 2 — RunManifest.topology_hash: Option<String> (Tier-1 optional, serde
default/skip — old manifests byte-identical, #156), threaded None into all 24
literal sites across 7 crates. Also fixed the aura-registry RunManifestRead
read-mirror to carry topology_hash (it was hardcoding None on load) — else a
stored hash would silently drop on the registry round-trip once Task 3 stores a
real one.

Task 3 — the shared run_signal_stage1r seam (hash the signal, wrap, compile with
params, bootstrap, run, manifest with params from param_space + topology_hash) +
the sha256_hex topology_hash helper (sha2 in aura-cli, off the frozen engine,
invariant 8). run_stage1_r now carries its topology_hash too (every run becomes
self-identifying, #158). The seam is unwired until Task 4 (transient
#[allow(dead_code)], retired there); RED-first seam tests added.

Verified: cargo test --workspace green (51 suites, 0 failures); cargo clippy
--workspace --all-targets -D warnings clean.

refs #165

Cargo.lock

@@ -69,6 +69,7 @@ dependencies = [
  "libc",
  "serde",
  "serde_json",
+ "sha2",
 ]
 
 [[package]]
@@ -735,6 +736,17 @@ dependencies = [
  "digest",
 ]
 
+[[package]]
+name = "sha2"
+version = "0.10.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7507d819769d01a365ab707794a4084392c824f54a7a6a7862f8c3d0892b283"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
 [[package]]
 name = "shlex"
 version = "2.0.1"