Function materialize_node_cached 

pub fn materialize_node_cached(
    parsed: &ParsedDescriptor,
    store: &dyn SeedStore,
    cache: &mut dyn OutputCache,
    node: &SeedNode,
    limits: Limits,
    budget: &mut EvalBudget,
    depth: u16,
    reuse: &mut ReuseStats,
) -> Result<Vec<u8>>

Materialize one node’s output, consulting cache at every node (including dependencies).

A hit returns the cached bytes without recursing into the node’s dependency closure and increments ReuseStats::nodes_reused; a miss evaluates the node (recursing through the same cache) and stores the output. Exact Q_ref nodes are cached too, since their output is equally a pure function of their id.