Function commonCore

src/context/approach-diff.ts:65–74

(texts: string[], cap = 8)

/** Terms (surface forms) whose stem appears in EVERY text — the stable core of the approach. PURE. */
export function commonCore(texts: string[], cap = 8): string[] {
  if (!texts.length) return [];
  const maps = texts.map(surfaceByStem);
  const out: string[] = [];
  for (const [s, w] of maps[0]!) {
    if (maps.every(m => m.has(s))) out.push(w);
    if (out.length >= cap) break;
  }
  return out;
}

const isMultiline = (t: string): boolean => t.split('\n').filter(l => l.trim()).length >= 3;