Function emit_into_code_graph 

pub fn emit_into_code_graph(
    index: &ClasspathIndex,
    graph: &mut CodeGraph,
    provenance: &[ClasspathProvenance],
) -> ClasspathResult<EmissionResult>

Emit classpath nodes and structural edges directly into a CodeGraph.

This mutates the graph in place so existing graph state such as confidence and epoch metadata is preserved. It commits staged nodes into the node arena, remaps staged edges, inserts them into the bidirectional edge store, remaps metadata keys, and returns the final classpath FQN -> NodeId map.

Errors

Returns ClasspathError::EmissionError if staging commit, string interning, or file registration fails.