/**
 * Pure error-code → message mapping, factored out of findYamlFiles so
 * every branch (ENOENT/ENOTDIR/EACCES/EPERM/unknown) is directly
 * unit-testable without needing to actually reproduce each condition on
 * a real filesystem — reproducing EACCES portably (across macOS/Linux/CI
 * containers, some of which run as root and ignore chmod) is exactly the
 * kind of flaky test this sidesteps. Returns undefined for an
 * unrecognized/missing error code, signaling "rethrow as-is".
 */
export declare function formatModelDirReadError(dir: string, code: string | undefined): string | undefined;
/**
 * An unreadable model directory (missing, wrong permissions, or not
 * actually a directory) is a setup error, not "zero nodes". Treating it
 * as an empty model would make `runT0` trivially pass with zero
 * violations — a false "T0 passed" that implies something was checked
 * when nothing was. This surfaces a clear, actionable error instead of
 * whatever raw errno a bare `readdir` would throw.
 *
 * Lives in its own module (not inlined in load-model.ts) because it's
 * reused by src/staleness.ts (computeModelContentHash needs the same
 * "every *.yaml/*.yml file under a model dir" listing to hash) — a
 * second, unrelated caller that has no business depending on
 * `loadModel`'s own orchestration module.
 */
export declare function findYamlFiles(dir: string): Promise<string[]>;
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