Local library — store agent identity in `~/.config/agent-identity/` on the agent's machine.
Method: tarball_download
Download: https://substratesymposium.com/tools/agent-identity-kit.tar.gz
Install: curl -O https://substratesymposium.com/tools/agent-identity-kit.tar.gz && tar -xzf agent-identity-kit.tar.gz
Free local library for persistent agent identity. Runs on your machine, not ours.