🧹 [Code Quality] Unused Variable: processed_files

Issue Description

Variable processed_files is initialized but never used.

Location

• File: R/ppi_network.R
• Line: 41

Problem

# Initialize networks list
networks <- list()
processed_files <- list()  # <- Never used!

# Process each data source
for (source in data_sources) {
  # ... code never assigns to processed_files
}

Solution

Remove the unused variable:

# Initialize networks list
networks <- list()

Impact

• Minor code cleanliness issue
• Could confuse code readers
• Linting tools will flag this

Priority

Low - Cosmetic issue