CodeGraph does not index call edges from anonymous/lambda functions

[Cyclone1070]

The call graph indexer misses call edges originating from anonymous/lambda function bodies. Functions called only from inline closures (e.g., cobra RunE handlers, goroutine literals, callback closures) appear to have zero callers in the graph.

Steps to Reproduce

Given a codebase like:

// cmd/factory.go
func Wire() (*Deps, error) { ... }

// cmd/root.go
var rootCmd = &cobra.Command{
    RunE: func(cmd *cobra.Command, args []string) error {
        deps, err := Wire()  // <-- call from anonymous closure
        ...
    },
}

codegraph_callers("cmd.Wire") → returns "No callers found"