Function read_contribution_resource 

pub fn read_contribution_resource(
    package: &AgentPackage,
    contribution_id: &str,
) -> Result<Option<AgentPackageResource>>

Read one contribution’s declared resource from inside package storage.

Ok(None) means either the contribution has no resource declaration or the agent has not created the declared file yet. Existing resources must be regular bounded UTF-8 files whose canonical path remains under the package storage directory. This function is read-only and never creates storage.