POPS4 Article Engine v3.0 — Margot
/health              — status + binding check
/run                 — publish new articles (also runs on cron)
/backfill?limit=N    — enrich existing articles with hero image + counsel rail
/backfill?limit=N&force=1 — re-enrich even if present
/test-image?url=X    — waterfall smoke test for one URL
/articles            — JSON index
/articles/slug       — individual article (HTML or JSON)
/sitemap.xml         — SEO sitemap
/products            — debug: merchant products cache