ainews: add AI news helper script with seen tracking

- Aggregates Simon Willison, OpenAI Blog, Sebastian Raschka
- Same workflow as derstandard: items marks as seen, auto-prunes at 200
- Updated all 4 AI news cron jobs to use new script
- Removed obsolete ai-news-seen.json

TOOLS.md

@@ -103,6 +103,30 @@ curl -s -X REPORT -u "$NEXTCLOUD_USER:$NEXTCLOUD_PASS" \
   "$NEXTCLOUD_URL/remote.php/dav/calendars/$NEXTCLOUD_USER/$CALDAV_CALENDAR/"
 ```
 
+## AI News RSS
+
+Helper script: `~/bin/ainews`
+
+```bash
+ainews items [max]          # NEW items only (filters out seen)
+ainews items --all [max]    # All items including already seen
+ainews article <url>        # Full article content via fivefilters
+ainews articles <url1>,<url2>,... # Fetch multiple + auto-mark as seen
+ainews seen                 # Show seen count and recent entries
+ainews reset                # Clear seen history
+```
+
+- Aggregates: Simon Willison, OpenAI Blog, Sebastian Raschka
+- Auto-tracks seen articles in `memory/ainews-seen.txt`
+- Auto-prunes to 200 entries
+
+**Workflow for AI news briefing:**
+1. `ainews items` → shows NEW articles, marks them as seen
+2. Pick interesting ones, optionally fetch full content with `articles`
+3. Next briefing: only shows articles published since last check
+
+---
+
 ## Der Standard RSS Summaries
 
 - **Schedule:** 4× daily: 10:00, 14:00, 18:00, 22:00 (Vienna time)