Add systemd timer deployment for scheduled ingestion cycle

- deploy/goodnews.service: oneshot unit running 'goodnews cycle' with a
  generous TimeoutStartSec so long classify runs are not killed.
- deploy/goodnews.timer: every 15 min, Persistent=true to catch missed runs.
- deploy/goodnews.env.example: LLM endpoint + DB path for the scheduled run.
- README: scheduling/install docs.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

deploy/goodnews.service

@@ -0,0 +1,21 @@
+[Unit]
+Description=goodNews ingestion cycle (poll due sources, classify, rebuild brief)
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+User=jay
+Group=jay
+WorkingDirectory=/home/jay/goodNews
+# Optional config (LLM endpoint, DB path). The leading '-' makes it non-fatal
+# if the file is absent.
+EnvironmentFile=-/etc/goodnews/goodnews.env
+ExecStart=/home/jay/goodNews/.venv/bin/python -m goodnews cycle
+# A cycle may classify dozens of articles through a local model; give it room
+# so systemd does not kill a long run (oneshot defaults to 90s).
+TimeoutStartSec=1200
+Nice=10
+
+[Install]
+WantedBy=multi-user.target