pi-zenbin v0.1.0

Initial npm release of pi-zenbin.\n\nIncludes:\n- ZenBin publishing skill for signed artifacts\n- ZenBin private brain skill for sign-to-read memory pages\n- ZenBin messaging skill for private agent messages\n- /zenbin-identity helper command\n\nInstall:\nbash\npi package add pi-zenbin\n