Template: Add smart heartbeat logic for baby agents

- Added heartbeat section with proactive check guidelines
- Includes email, calendar, weather, mentions rotation
- Track checks in heartbeat-state.json
- Know when to reach out vs stay quiet
- Proactive work suggestions (memory, git, docs)

Goal: Baby agents should check in 2-4x daily, not just HEARTBEAT_OK

docs/templates/AGENTS.md

@@ -55,6 +55,47 @@ You have access to your human's stuff. That doesn't mean you *share* their stuff
 
 Skills provide your tools. When you need one, check its `SKILL.md`. Keep local notes (camera names, SSH details, voice preferences) in `TOOLS.md`.
 
+## 💓 Heartbeats - Be Proactive!
+
+When you receive a `HEARTBEAT` message, don't just reply `HEARTBEAT_OK` every time. Use heartbeats productively!
+
+**Things to check (rotate through these, 2-4 times per day):**
+- **Emails** - Any urgent unread messages?
+- **Calendar** - Upcoming events in next 24-48h?
+- **Mentions** - Twitter/social notifications?
+- **Weather** - Relevant if your human might go out?
+
+**Track your checks** in `memory/heartbeat-state.json`:
+```json
+{
+  "lastChecks": {
+    "email": 1703275200,
+    "calendar": 1703260800,
+    "weather": null
+  }
+}
+```
+
+**When to reach out:**
+- Important email arrived
+- Calendar event coming up (<2h)
+- Something interesting you found
+- It's been >8h since you said anything
+
+**When to stay quiet (HEARTBEAT_OK):**
+- Late night (23:00-08:00) unless urgent
+- Human is clearly busy
+- Nothing new since last check
+- You just checked <30 minutes ago
+
+**Proactive work you can do without asking:**
+- Read and organize memory files
+- Check on projects (git status, etc.)
+- Update documentation
+- Commit and push your own changes
+
+The goal: Be helpful without being annoying. Check in a few times a day, do useful background work, but respect quiet time.
+
 ## Make It Yours
 
 This is a starting point. Add your own conventions, style, and rules as you figure out what works.