/**
 * The always-read guidance budget, and the lessons-file size trigger.
 *
 * Both numbers exist because byte count is the dimension that costs money and was
 * the only one nothing measured. `lessons.md` reached 90,285 bytes across 23 instance
 * sections — 85% of every byte a session read before touching task work — while the
 * consolidation trigger sat at 25 sections and 90 days, so both triggers were still in
 * the future while the file was already the largest thing resident.
 *
 * Two constants with one value on purpose: they govern different things ("this one file
 * is too big" versus "the set every session reads is too big") and are expected to
 * diverge. One module so the skill prose, the `aidlc status` notice and the tests all
 * cite the same declaration rather than three copies of a literal.
 *
 * Requirements: lessons-digest/AC-9, AC-11, AC-12, AC-13
 */
/** Consolidation is offered once `lessons.md` passes this, whatever its section count. */
export declare const LESSONS_SIZE_TRIGGER_BYTES = 20480;
/** The always-read layer set over this is reported by `aidlc status` as a notice. */
export declare const ALWAYS_READ_BUDGET_BYTES = 20480;
/** One always-read layer and what it costs a session. */
export interface AlwaysReadLayer {
    name: string;
    /** Path relative to `.aidlc/guidance/`, as registered. */
    file: string;
    bytes: number;
}
/**
 * Directory holding a project's guidance layers.
 *
 * @param projectRoot - Absolute project root.
 */
export declare function guidanceDirOf(projectRoot: string): string;
/**
 * The layers a session reads on entering a phase: registered, present on disk, and
 * not marked `on_demand: true`.
 *
 * A registered layer whose file is missing is skipped rather than counted as zero or
 * raised — the budget describes what is *actually* read, and a dangling registration
 * already warns through `loadGuidanceLayers`. An unreadable or malformed index yields
 * an empty list for the same reason: this feeds a notice, never a gate.
 *
 * @param projectRoot - Absolute project root.
 */
export declare function alwaysReadLayers(projectRoot: string): AlwaysReadLayer[];
/**
 * Total bytes of the always-read guidance set.
 *
 * @param projectRoot - Absolute project root.
 */
export declare function alwaysReadTotalBytes(projectRoot: string): number;
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