-- §22.4a SLICE-1 — configurable collection metadata: malformed-sidecar flag.
--
-- The corpus mirror reads an entry's metadata from its `<slug>.meta.yaml`
-- sidecar (dual-read: sidecar-else-legacy-frontmatter). A sidecar that does not
-- parse as a YAML mapping never hard-fails the read (INV-3) — the entry still
-- loads (from the legacy `.md` frontmatter if present) and this derived flag
-- marks it so the catalog can surface it. Additive only — no rebuild. 0 = ok.
ALTER TABLE cached_rfcs ADD COLUMN metadata_malformed INTEGER NOT NULL DEFAULT 0;