Function iot_stack 

pub fn iot_stack(
    path: PathBuf,
) -> Result<BloomBlockStore<CachedBlockStore<SledBlockStore>>>

Create a minimal resource stack for IoT/embedded devices

Ultra-low resource usage with:

• 5MB cache
• Small bloom filter (1000 expected items)
• Minimal batch sizes

Best for: Raspberry Pi, embedded systems, resource-constrained environments