/**
 * Strict word-aware option matching for flow CASE conditions (APPROVED_FUNCTIONS.matchesChoice) —
 * replaces the substring `.some(choice => input.includes(choice))` idiom, whose false positives broke
 * branch routing ('si' inside "imposible"/"así" matched YES, prod-observed 2026-08-09).
 *
 * Rules (deliberately NO fuzzy/prefix matching):
 *  - single-word choice: exact word membership
 *  - multi-word choice: exact word-sequence containment
 *  - plurals/inflections: enumerate them explicitly in the choice list
 *  - a keypad key (one digit, * or #) matches ONLY an answer that is exactly that key, never a key
 *    inside a longer answer (owner rule): "I made payments by 1," at "press 1 to pay" charged the full
 *    amount due on dev, 2026-10-14
 *  - an ELONGATED word the user typed is forgiven (2026-10-01): a repeated vowel or any letter typed
 *    3+ times collapses — "Sii" matches 'si', "nadaaaa" 'nada', "yesss" 'yes'. A typed "Sii" at the
 *    authentication retry menu ended the conversation in contact-support. Only the user's word is
 *    collapsed, and only against an option word with no doubled letter of its own. Measured on a
 *    week of prod prompts (scratch replay, 98 option lists × 23,692 prompts):
 *      · collapsing BOTH sides: rejected — 'all' → 'al' made "servicio al cliente" (138 turns) pick
 *        the "all" option, and 'mm' → 'm' made "I'm" a filler;
 *      · collapsing every doubled letter of the user's word: rejected — "mess" matched Spanish
 *        'mes' and "Mall" 'mal'. A doubled consonant is real spelling, so "okk" stays unmatched.
 *
 * Zero imports, so scripts/tests/matches-choice.mjs runs the real implementation.
 */
export function matchesChoice(input: any, choices: any): boolean;
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