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Task decomposition for PrimitiveBuilder::bind (spec 0034): T1 the method + aura-core unit tests (Probe node drives positional reconstruction RED→GREEN; three should_panic), T2 node-vehicle coverage (Sma/LinComb via eval in aura-std), T3 Composite param_space coverage + construction-layer zero-change guard + workspace gate. Crate-topology aware: aura-core unit tests use a local Probe, not Sma/LinComb (no upward dep). refs #55