/**
 * Hook-emitted boolean flags, read once and read the same way everywhere.
 *
 * `jq` preserves JSON types, so a hook's `{bg:1}` arrives as a **number**, not a
 * boolean or a string. Truthiness is not enough (`'0'` is truthy) and equality
 * with `true` is not enough either, so every consumer needs this exact reading —
 * and the review round found two copies of it that had already drifted: the
 * spool's accepted `1 | true | '1'` while the command pass had a second copy
 * that also had to be taught `'true'`. One definition, so a flag can never mean
 * one thing to capture and another to certification.
 *
 * The permissive direction is the safe one for every current caller: each of
 * these flags means "yes" for a DISQUALIFIER (`bg`) or for positively-proven
 * evidence (`zero`, `subst`), so reading more spellings as true can only refuse
 * more, never assert more.
 */
export declare function readJsonFlag(value: unknown): boolean;
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