chore: add codex refactor loop script

scripts/codex-refactor-loop.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
+cd "${REPO_ROOT}"
+
+SLEEP_SECONDS="${SLEEP_SECONDS:-600}"
+MAX_ITERATIONS="${MAX_ITERATIONS:-0}" # 0 means run forever
+CODEX_MODEL="${CODEX_MODEL:-gpt-5.3-codex}"
+CODEX_REASONING_EFFORT="${CODEX_REASONING_EFFORT:-medium}"
+
+read -r -d '' PROMPT <<'EOF' || true
+1. load the refactor skill
+2. check previous commits to see what other agents have worked on
+3. identify and work on a single improvement based on the refactor skill (can be a file system reorg, file splitting, refactor, add a new test, harden a test, deflakify a test, fix a test, improve control flow, remove unused code)
+4. commit with a description of what was done, your reasoning, and document accomplishments or challenges for the next agent
+EOF
+
+iteration=1
+while true; do
+  if [[ "${MAX_ITERATIONS}" -gt 0 && "${iteration}" -gt "${MAX_ITERATIONS}" ]]; then
+    echo "Reached MAX_ITERATIONS=${MAX_ITERATIONS}; exiting."
+    exit 0
+  fi
+
+  echo "[$(date -u +"%Y-%m-%dT%H:%M:%SZ")] Starting codex exec iteration ${iteration}"
+
+  cmd=(
+    codex exec
+    --dangerously-bypass-approvals-and-sandbox
+    --cd "${REPO_ROOT}"
+  )
+
+  if [[ -n "${CODEX_MODEL}" ]]; then
+    cmd+=(--model "${CODEX_MODEL}")
+  fi
+
+  cmd+=(-c "model_reasoning_effort=\"${CODEX_REASONING_EFFORT}\"")
+
+  if "${cmd[@]}" "${PROMPT}"; then
+    echo "[$(date -u +"%Y-%m-%dT%H:%M:%SZ")] Iteration ${iteration} completed successfully"
+  else
+    status=$?
+    echo "[$(date -u +"%Y-%m-%dT%H:%M:%SZ")] Iteration ${iteration} failed with exit code ${status}"
+  fi
+
+  echo "Sleeping ${SLEEP_SECONDS}s before next iteration..."
+  sleep "${SLEEP_SECONDS}"
+  iteration=$((iteration + 1))
+done