/**
 * [ref] R12 收编叶子 — the sha256 content-address SHAPE constants, single-sourced. A neutral leaf (no
 * imports of its own) so both `security.ts`-adjacent modules and prompt/image/session-sync consumers can
 * depend on it without a layering edge. Six call sites across the tree each ran their OWN literal copy of one
 * of these two regexes (a bare-hex form and a scheme-qualified form) — same shape, independently typed out.
 * This module is the single point of truth for the SHAPE; each consumer's accept POLICY (prefix-stripping,
 * case-folding order) is UNCHANGED by this collection — those policies differ across call sites (a real,
 * pre-existing divergence, not introduced here) and are tracked for a follow-up cross-repo alignment, not
 * unified in this refactor.
 */
/** A bare sha256 content-address: exactly 64 lowercase-hex characters, no scheme prefix. */
export declare const SHA256_HEX_RE: RegExp;
/** A scheme-qualified sha256 content-address: `sha256:` followed by 64 lowercase-hex characters. */
export declare const SHA256_DIGEST_RE: RegExp;
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