chore: add Codex and agent workflow foundation

scripts/doctor.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+echo "== Repo doctor =="
+
+test -f AGENTS.md && echo "AGENTS.md: OK" || { echo "AGENTS.md: MISSING"; exit 1; }
+test -f .codex/config.toml && echo ".codex/config.toml: OK" || { echo ".codex/config.toml: MISSING"; exit 1; }
+test -d .codex/agents && echo ".codex/agents: OK" || { echo ".codex/agents: MISSING"; exit 1; }
+test -d docs && echo "docs/: OK" || { echo "docs/: MISSING"; exit 1; }
+
+branch="$(git rev-parse --abbrev-ref HEAD)"
+echo "Current branch: ${branch}"
+
+if [[ "${branch}" == "main" || "${branch}" == "develop" ]]; then
+  echo "Warning: create a task branch before making changes."
+fi
+
+echo "Doctor completed."