v6.3.1

Fixed

• Kingambit was reported illegal in Regulation Set M-C. The Bulbapedia
  page the rosters were scraped from omits Kingambit from its M-C eligible
  list (it appears in no revision of the page), so check_legality and
  team_io rejected a species with 29% measured M-C usage. The roster is
  restored from the official Pokémon Champions event pages (231 species;
  M-C adds 23 over M-B, not 29 as the notes claimed).

Changed

• Regulation rosters are now cumulative. The M series builds each set on
  the previous one, and the data reflects that: regulations.data.ts stores
  M-A in full (base) plus each later set's additions, and the full
  per-set lists are derived at load. Eligible species come straight from the
  official event pages — the Bulbapedia dependency that caused the Kingambit
  omission is gone — and extract-regs.mjs now fails without writing on any
  drop or source disagreement. Ingesting M-D is three steps: add the set to
  the script and to METADATA, run the script, run npm test. The golden
  tests pin the official roster sizes, Kingambit's M-C membership, and the
  no-drops invariant.