/**
 * Validate a phase directory slug before it is used in a filesystem path.
 * Phase slugs are directory names under `.cadence/phases/`, never paths.
 */
export declare function assertSafePhaseSlug(phaseArg: string): string;
/**
 * Build a canonical `PP-TT` phase-task id from a phase arg (slug or number) and
 * a task-number arg. Each half is zero-padded to a minimum of two digits and
 * grows wider as needed (phase 100 → `100`). Throws if `phaseArg` has no leading
 * numeric token.
 */
export declare function derivePhaseTaskId(phaseArg: string, numArg: string): string;
/** Convert a human title into the slug suffix used by auto-derived phases. */
export declare function phaseSlugFromTitle(title: string): string;
/** Build the auto-derived phase directory name from a next-free number + title. */
export declare function derivePhaseSlug(phaseNumber: number, title: string): string;
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