/**
 * Read the nearest enclosing package.json's `version` field.
 *
 * Pass `import.meta.url` from the calling module. The function walks
 * up from that module's directory until it finds a package.json, then
 * returns its `version`. This is the standard way for a Tool to set
 * its `metadata.version` without duplicating the literal in source.
 *
 * Result is cached per `metaUrl` so subsequent calls from the same
 * module are O(1).
 *
 * Returns `'0.0.0'` if no package.json is found or if it lacks a
 * version field — Tools should treat that as "version unknown" rather
 * than crash. In practice this only happens in malformed installs.
 */
export declare function readPackageVersion(metaUrl: string): string;
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