feat: claude one-shot port from nanobot python codebase (v0.1.4.post4)

templates/HEARTBEAT.md

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+# Heartbeat Tasks
+
+This file is checked every 30 minutes by your nanobot agent.
+Add tasks below that you want the agent to work on periodically.
+
+If this file has no tasks (only headers and comments), the agent will skip the heartbeat.
+
+## Active Tasks
+
+<!-- Add your periodic tasks below this line -->
+
+
+## Completed
+
+<!-- Move completed tasks here or delete them -->
+