MVP: keep only prompts/system_prompt.md and CodexHelper/CodexHelper.sh; remove NEWSTART artifacts

CodexHelper/CodexHelper.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# CodexHelper.sh — minimal wrapper to invoke Codex CLI
+# - Finds a codex binary (env `CODEX_BIN`, or `codex`, or `codex-cli`)
+# - Uses the repository's prompts/system_prompt.md by default
+# - Passes through any extra args to the codex binary
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="${SCRIPT_DIR}/.."
+SYSTEM_PROMPT_PATH="${REPO_ROOT}/prompts/system_prompt.md"
+
+if [[ ! -f "${SYSTEM_PROMPT_PATH}" ]]; then
+  echo "Error: system prompt not found at ${SYSTEM_PROMPT_PATH}" >&2
+  exit 1
+fi
+
+# Binary detection per NEWSTART.md guidance
+if [[ -n "${CODEX_BIN:-}" ]]; then
+  BIN="${CODEX_BIN}"
+elif command -v codex >/dev/null 2>&1; then
+  BIN="$(command -v codex)"
+elif command -v codex-cli >/dev/null 2>&1; then
+  BIN="$(command -v codex-cli)"
+else
+  echo "Error: Could not find codex binary. Set CODEX_BIN or install 'codex'/'codex-cli'." >&2
+  exit 1
+fi
+
+# Try a common flag name for supplying a system prompt. Adjust if needed.
+# Additional args are forwarded so callers can customize behavior.
+exec "${BIN}" --system-prompt "${SYSTEM_PROMPT_PATH}" "$@"
+