AI-agent workflows have a boring but important problem: a good process often lives inside one runtime. Signum started as a Claude Code plugin. That was the right first layer: slash command, local artifacts, contract-first pipeline, proofpack. But the principle is not Claude-specific. If an agent writes code in Codex App, it needs the same context: contract before implementation, verification after implementation, proof in files instead of "looks done" in chat. The latest Signum changes close that distribution gap: Signum can now be added to Codex App through the Plugins UI. What changed Signum now ships a complete Codex App install surface: .codex-plugin/plugin.json .agents/plugins/marketplace.json platforms/codex/.codex-plugin/plugin.json platforms/codex/SKILL.md platforms/codex/assets/signum-icon.png Enter fullscreen mode Exit fullscreen mode This is not a README instruction that says "copy this prompt".…