The signals stage upserts each eligible article's matched interests; an
LLM batch files uncategorized interests before the prompt is built (and on
demand as the interests-categorize job); `interests import` and
`interests backfill` load the OPML and seed match rows once.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K9PrjtUS16PAQve8D4bHgc