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docs/architecture/adr/0006-rest-websocket.md

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+# ADR 0006 — REST plus WebSocket
+
+**Status:** Accepted baseline
+
+## Decision
+
+Use versioned REST for requests/configuration/history and one authenticated WebSocket per browser session for bounded live updates.
+
+## Rationale
+
+REST is clear for CRUD/query operations. WebSocket supports low-latency subscriptions and server-side coalescing without repeated polling of full datasets.
+
+## Consequences
+
+- Messages use explicit schema/version/sequence.
+- Reconnect and resync are required.
+- Subscription, rate, size and buffer limits are mandatory.