Function load_default_memory_config 

pub fn load_default_memory_config() -> MemoryConfig

Load the default memory configuration using unified config resolution.

Resolution order:

1. ENACT_MEMORY_CONFIG_PATH environment variable
2. ./memory.yaml in current working directory
3. ~/.enact/memory.yaml
4. Hardcoded defaults

Example

use enact_memory::config::load_default_memory_config;

let config = load_default_memory_config();
println!("Backend: {}", config.backend);