Summary

• Change CMake export namespace from NetworkSystem:: to network_system:: to adopt ecosystem convention of <package_name>:: snake_case namespace
• Update the network_system_LIBRARIES variable to reference the new network_system::NetworkSystem target
• Existing backward compatibility variables (NetworkSystem_FOUND, NetworkSystem_LIBRARIES, etc.) remain in place and continue to work for downstream consumers still using the old namespace convention

Related Issues

• Closes chore(cmake): Standardize namespace to snake_case (NetworkSystem:: → network_system::) #852
• Part of chore(cmake): Standardize install(EXPORT) naming and namespace convention across ecosystem common_system#456

What Changed

Backward Compatibility

The config file already provides legacy variable aliases:

set(NetworkSystem_FOUND TRUE)
set(NetworkSystem_LIBRARIES ${network_system_LIBRARIES})
# ... etc.

These variables continue to resolve correctly under the new namespace.

Test plan

• Verify find_package(network_system) resolves network_system::NetworkSystem target
• Verify legacy ${NetworkSystem_LIBRARIES} variable still works for existing consumers
• CI builds pass on all platforms