Symphony Setup Set up Symphony — OpenAI's orchestrator that turns Linear tickets into pull requests via autonomous Codex agents. Preflight checks Run these checks first and stop if any fail — resolve before continuing: 1. — run . Must be installed and authenticated. 2. — run . Needed for Elixir/Erlang version management. 3. — run . Must be installed AND authenticated. Agents use to create PRs and close orphaned PRs. Silent failure without it. 4. — run . Must persist across sessions (shell config, not just ). 5. Linear MCP — verify Linear MCP is available. If not, set it up: - Claude Code: - C…