Add smart newsletter digest with feedback learning

- Runs daily at 8 PM Australia/Perth time
- Fetches newsletters from past 24 hours via IMAP
- Scores based on learned preferences (topics, sources)
- Summarizes key points and highlights
- Sends digest to Telegram + Gotify
- Learns from user feedback (👍/👎/topic preferences)
- Preferences stored in newsletter-preferences.json

automations/newsletter-digest/README.md

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+# Smart Newsletter Digest
+
+**Runs:** Daily at 8:00 PM (Australia/Perth)  
+**Sends to:** Telegram + Gotify  
+**Learns from your feedback!**
+
+## How It Works
+
+1. **Fetches** newsletters from past 24 hours via IMAP
+2. **Scores** them based on your preferences
+3. **Summarizes** key points and highlights
+4. **Sends** digest to Telegram
+5. **Learns** from your feedback
+
+## Feedback System
+
+After each digest, reply with:
+
+| Reply | Effect |
+|-------|--------|
+| 👍 | Reinforces current selections |
+| 👎 | Adjusts to show less like this |
+| `more AI` | Adds "AI" to liked topics |
+| `less crypto` | Adds "crypto" to disliked topics |
+| `prefer The Rundown` | Boosts this source |
+
+## Preferences File
+
+`newsletter-preferences.json` stores:
+- `liked_topics` - Topics to prioritize
+- `disliked_topics` - Topics to de-emphasize  
+- `preferred_sources` - Senders to boost
+- `avoided_sources` - Senders to skip
+- `feedback_count` - How many times you've given feedback
+
+## Manual Run
+
+```bash
+./smart-digest.sh
+```
+
+## Files
+
+- `smart-digest.sh` - Main script
+- `newsletter-preferences.json` - Your learned preferences
+- `digest-history.json` - Last 7 days of digests (for feedback reference)
+
+---
+
+**Krilly will learn what you like!** 🦀