Treasury debt composition (MSPD) + auction demand (bid-to-cover)

K15 consumer slice (task #25): the v152 MSPD composition read — total public debt outstanding + marketable/nonmarketable split + the marketable class breakdown (amounts published in MILLIONS of dollars; the panel displays trillions) — plus the per-type auction-demand summary (bid-to-cover over the recent completed-auction window). FREE public-domain Treasury FiscalData — deliberately ungated (sf_monetization_v3; matches the /api/macro/* siblings).

Honest omission end-to-end: the headline comes ONLY from the published Total row (never summed from parts — a partial ingest must not fabricate a smaller total); classes render only when their published figure parses. Degrades to {rows: [], auctions: [], count: 0} when PG is unavailable or pre-first-ingest — the FE panel stays empty, never a broken card.