Packages the prebuilt pi release binary and puts it on PATH alongside
Claude Code, Codex and opencode.
pi has no `@file` imports in context files, so the shared agent-skills
fragments are concatenated into ~/.pi/agent/AGENTS.md. Skills need no
wiring: pi already reads ~/.agents/skills.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>