feat: add catch-up systemd timer and runner script for main.py

Co-authored-by: aider (openai/gpt-5) <aider@aider.chat>

scripts/run_main.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Change to the repository root (one level up from this script's directory)
+cd "$(dirname "$0")/.."
+
+# Prefer uv if available (uses pyproject.toml/uv.lock), otherwise fall back to system Python.
+if command -v uv >/dev/null 2>&1; then
+  uv run python -u main.py
+else
+  python3 -u main.py
+fi