Completes training data coverage for all 8 blog types: market_alert(2), comparison(1), technology_deep_dive(4), tutorial(3), hype_cycle(1), buying_guide(1), migration_guide(1), new_product(1), competitor_analysis(1) — 15 gold-standard articles total
Reference quality articles covering: 400G DR4 pricing, vendor lock-in, silicon photonics, fiber plant readiness, 400ZR reality check, DOM diagnostics, 800G readiness. All follow strict FO Blog Pipeline rules — no markdown headers, no spec dumps, one thesis per article.
