/**
 * Scaffold Codex workspace configuration files.
 * Creates .openai/config.toml and AGENTS.md if they do not exist.
 * SPEC-708: also injects a host-aware Planu rules block into AGENTS.md (idempotent).
 * The body of AGENTS.md is never overwritten; only the rules block between
 * `<!-- planu:rules:start -->` markers is replaced on subsequent runs.
 * Safe to call on non-Codex environments — skips silently unless markers are present.
 */
export declare function scaffoldCodexConfig(projectPath: string, planuVersion?: string): Promise<void>;
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