/**
 * Dev-only HTTP API to patch Vault-lite without restarting the server.
 * POST /_nexus/dev/vault — body: `{ patch: Record<string,string>, replace?: boolean }`
 * Optional auth: `NEXUS_DEV_VAULT_TOKEN` → require `Authorization: Bearer …` or `x-nexus-dev-vault-token`.
 */
export declare function handleDevVaultPost(request: Request): Promise<Response>;
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