Update news-seen.json with latest articles from 2026-01-31 10:00 briefing

HEARTBEAT.md

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+# HEARTBEAT.md
+
+Check the following and notify only once per event (track in `memory/heartbeat-state.json`):
+
+1. **USA-Iran conflict**: Fetch news (RSS or search). If USA attacks/strikes Iran militarily, notify immediately. Only notify once when it first happens.
+
+2. **Rheinmetall stock (RHM)**: Check current price. If above €1950, notify. Only notify once when threshold is crossed.
+
+3. **Evening check-in (learning phase)**: If Vienna time is between 21:00-00:00, send a brief WhatsApp asking what user is doing (working? winding down? etc.). Log responses in `memory/wind-down-log.json`. Goal: learn wind-down patterns to predict when to stop starting new things.
+
+4. **Proactive calendar reminders**: Check CalDAV for upcoming events (see TOOLS.md for credentials). Send ONE reminder per event at appropriate lead time:
+   - Video calls / online meetings: 15 min before
+   - In-person / location-based: 1-2 hours before (account for travel)
+   - Appointments (doctor, haircut, etc.): 1 hour before
+   Track sent reminders in `memory/calendar-reminders-sent.json` to avoid duplicates.
+
+5. **Steam Machine / Steam Frame**: Check for **official Valve news only** about pricing or release date. Notify once when official price or specific release date is announced. Baseline: "early 2026" window, no price yet.
+
+If nothing new to report, reply HEARTBEAT_OK.