/**
 * Render the substrate docs that should surface alongside a just-read file.
 *
 * @param nodeId        the canvas node whose subject gates the docs.
 * @param readFilePath  the path the `read` tool returned (absolute or not — it
 *                      is resolved to a realpath internally).
 * @param seen          the CALLER-owned, per-session set of already-injected
 *                      doc realpaths. Docs already present are skipped; newly
 *                      injected docs are added. Pass the same set across reads
 *                      within a session (clear it on session_start) to get the
 *                      once-per-session dedup; omit it for a standalone render.
 * @returns the `<auto-loaded-context>` envelope, or '' when nothing surfaces.
 */
export declare function renderOnReadDocs(nodeId: string, readFilePath: string, seen?: Set<string>): string;