Cron Universe Dead Feeds

UNI-DEAD-01 (2026-10-12): list — and with ?apply=true retire — the screener_universe rows whose price feed is dead (no traded price_history bar AND no screener_cache quote stamp within 14 days of the feed's latest session; first seen >= 21 days ago; manual / manual_include rows exempt).

DRY RUN by default: returns the list, writes nothing. apply=true sets included=false (capped 60/run, reversible — not manual_exclude) and deletes their screener_cache / options_screener_cache rows; price_history is never touched. The weekly refresh-universe build runs the same pass with apply before its upsert. Synchronous (a few dozen reads). Auth: X-Cron-Secret.