Function handle_process_queue 

pub fn handle_process_queue(
    _config: &CliConfig,
    args: ProcessQueueArgs,
) -> Result<()>

Handle the process-queue command for progressive ingestion enrichment.

This command processes frames in the enrichment queue:

• Re-extracts full text for skim (time-limited) extractions
• Updates the Tantivy index with enriched content
• Marks frames as Enriched when complete