docs: instructions for agents

Author: zah

.github/copilot-instructions.md

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+../AGENTS.md

AGENTS.md

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+# Guidelines for Codex Agents
+
+This repository is a devops environment.
+
+When problems arise with the tooling or dependencies, **do not give up**.
+Research the issue online and attempt to resolve it.
+
+You may install additional software either by extending the Nix development
+environment or by using the Ubuntu package manager. The primary goal is to
+overcome environment issues so that the tooling here works correctly.