/**
 * Coverage matrix builder: resolves references against the cross-instance
 * registry (uniqueness rule, D5) and unions scan ∪ block coverage per AC.
 *
 * Bare `AC-n` counts only when exactly one AC-bearing instance defines id n
 * (AC-24); qualified `<instance>/AC-n` always resolves to that instance
 * (AC-25). Retired ACs never require coverage; references to them warn
 * (AC-14). Only `uncoveredActive` fails gates — warnings are data (DD6).
 *
 * Requirements: traceability-ids/AC-9..AC-15, AC-24, AC-25
 */
import type { AcCoverageEntry, AcReference, ParsedRequirements } from './types.js';
import type { CoverageBlockEntry } from './coverage-block.js';
export interface MatrixInput {
    /** Target instance name. */
    instance: string;
    /** Target instance's parsed requirements. */
    parsed: ParsedRequirements;
    /** All instances' parsed requirements (registry, keyed by instance). */
    registry: Map<string, ParsedRequirements>;
    /** Scanned references from test files. */
    refs: AcReference[];
    /** Entries from the target instance's ac-coverage block. */
    blockEntries: CoverageBlockEntry[];
    /** Posix-relative path of the target instance's testing.md. */
    testingPath: string;
}
export interface MatrixOutput {
    entries: AcCoverageEntry[];
    warnings: string[];
    uncoveredActive: number[];
}
/** Build the coverage matrix for one instance. */
export declare function buildMatrix(input: MatrixInput): MatrixOutput;
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