- Create shared/filename_utils.py for date/time/dimension filename building
- Create shared/path_utils.py for output directory handling
- Create shared/discord/message_builder.py for Discord message construction
- Create shared/discord/cdn_extractor.py for CDN URL extraction
- Refactor image_node.py to use shared utilities (-161 lines, 16.3%)
- Refactor video_node.py to use shared utilities (-361 lines, 23.1%)
- Fix setup_logging missing from logging_config.py
- Fix test imports to use new module paths (nodes.* instead of discord_*_node)
- Total reduction: 522 lines (20.5%), exceeding PRD target of ~200 lines
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
