/**
 * changelog-gate, asserts CHANGELOG.md carries a section for a version.
 *
 * Supports both heading conventions in the estate: `## [1.2.3]` (SDK/TUI
 * bracketed) and `## 1.2.3` (agent plain). Pure over injected text.
 */
export type ChangelogHeading = 'bracket' | 'plain' | 'either';
/** Build the anchored header matcher for a version under the given convention. */
export declare function changelogHeaderPattern(version: string, heading: ChangelogHeading): RegExp;
/** True when `changelog` contains a section for `version`. */
export declare function hasChangelogSection(changelog: string, version: string, heading?: ChangelogHeading): boolean;
export interface ChangelogGateResult {
    readonly ok: boolean;
    readonly detail: string;
}
/** Gate a changelog for a version; returns a structured result (no process exit). */
export declare function runChangelogGate(changelog: string, version: string, heading?: ChangelogHeading): ChangelogGateResult;
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