/** Pure: extract `fidelity.modes` from a spec YAML string, or null if absent. */
export declare function extractFidelityModes(specYaml: string): string[] | null;
/** Load `fidelity.modes` for a story from `<repoRoot>/specs/story-<id>.yaml`. */
export declare function loadFidelityModes(repoRoot: string, story: string): string[] | null;
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