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docs/architecture.md

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+# System Architecture
+
+## Overview
+Describe the project at a high level.
+
+## Components
+- sensors / input devices
+- processing node
+- communication
+- storage
+- dashboard / app
+- actuators / notifications
+
+## Data Flow
+Describe how data moves through the system.
+
+## Decisions and Tradeoffs
+Explain key design choices.
+
+## Validation Plan
+Describe how you will test the system.