Closes the cycle-1 test coverage for #165. The `aura run <blueprint.json>` CLI
arm itself (the .json dispatch + parse_blueprint_run_args + BlueprintRunArgs)
shipped in ff4a1b3; this adds the coverage that proves it and the in-repo demo
blueprint:
- crates/aura-cli/tests/fixtures/stage1_signal.json — the canonical SMA-cross
signal (blueprint_to_json of stage1_signal(2,4)); emit_demo_signal_fixture
(#[ignore]) regenerates it.
- crates/aura-cli/tests/fixtures/unknown_node.json — one type set to "Nope" for
the fail-clean guard.
- loaded_signal_runs_bit_identical_to_rust_built (the keystone, C1): a signal
serialized -> loaded via blueprint_from_json -> run is bit-identical to its
Rust-built twin, incl. topology_hash (64-hex).
- topology_hash_is_stable_and_distinguishes (#158 anchor property).
- cli_run.rs E2E: `aura run <demo>` exits 0 with topology_hash in the manifest;
an unknown-node blueprint fails clean with UnknownNodeType (the #160 closed-set
guard at the data-plane face, invariant 9).
Verified end-to-end by actually running the binary: `aura run stage1_signal.json`
-> RunReport with a 64-hex topology_hash, sim-optimal+risk-executor broker, R
metrics; `aura run unknown_node.json` -> UnknownNodeType("Nope"), exit 2. Full
workspace suite green; clippy --all-targets -D warnings clean.
refs #165
