plan: 0024 node signature in blueprint
Five-task, compile-gate-sequenced plan for the behaviour-preserving refactor: aura-core types (PortSpec/PrimitiveBuilder/NodeSchema/lookbacks) -> aura-std 8 nodes -> aura-engine lib (Composite absorbs Blueprint, signature/derive_ signature, FlatGraph, pre-build validate_wiring, bootstrap reshape) -> engine tests -> aura-cli/ingest + compile-only render. Per-crate partial build gates; workspace gate only in the final task. One working-tree unit (committed once after Task 5 green). refs #43 #36
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