download-job-integration-docs

What Was Built

• Images::Downloader -- Service object that downloads a single image via Faraday, validates content type against allowed list, enforces max_download_size, derives filenames from URL or generates random names. Returns nil on any failure for graceful fallback. 11 tests.
• DownloadContentImagesJob -- Background job taking item_id. Reads item.content for inline images, downloads via Downloader, attaches blobs to item_content.images via Active Storage, rewrites item.content with blob serving URLs. Idempotent (skips if images already attached). Graceful per-image failure handling. Runs on fetch queue. 10 tests.
• EntryProcessor integration hook -- enqueue_image_download called after item creation. Only fires when config.images.download_enabled? is true and item.content is non-blank. Wrapped in rescue so failures never break feed processing. 5 tests.
• sm-configure skill docs -- Added config.images section to SKILL.md (table row, quick example, source file entry) and full ImagesSettings documentation to configuration-reference.md.

Files Modified

• lib/source_monitor/images/downloader.rb -- new (Downloader service)
• lib/source_monitor.rb -- added Downloader autoload
• app/jobs/source_monitor/download_content_images_job.rb -- new (background job)
• lib/source_monitor/fetching/feed_fetcher/entry_processor.rb -- added enqueue_image_download hook + private method
• test/lib/source_monitor/images/downloader_test.rb -- new (11 tests)
• test/jobs/source_monitor/download_content_images_job_test.rb -- new (10 tests)
• test/lib/source_monitor/fetching/feed_fetcher/entry_processor_test.rb -- new (5 tests)
• .claude/skills/sm-configure/SKILL.md -- added Images row, quick example, source file
• .claude/skills/sm-configure/reference/configuration-reference.md -- added ImagesSettings section