Add 5 component data-flow diagrams (Mermaid source + PNG)

- otopcua-dataflow: equipment → drivers (8, with stability tiers) → namespaces → ACL → consumers
- redpanda-eventhub: site ScadaBridge → store-and-forward → central cluster (topics + retention tiers + schema registry) → enterprise consumers
- snowbridge-dataflow: source adapters (Historian/Redpanda) → governed selection + approval workflow → Snowflake landing
- scadabridge-dataflow: OtOpcUa inputs → scripts/templates → multiple outputs (Redpanda, Web APIs, DB, email, equipment writes, Camstar)
- snowflake-dbt-dataflow: landing → staging → curated layer (dim_equipment, fact_state_transitions, mart_oee) → Power BI / AI/ML / ad-hoc

outputs/diagrams/redpanda-eventhub.mmd

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+flowchart LR
+    subgraph Sites["Site ScadaBridge Clusters"]
+        SB1["ScadaBridge<br/>Warsaw West"]
+        SB2["ScadaBridge<br/>Shannon"]
+        SB3["ScadaBridge<br/>Ponce"]
+        SBN["ScadaBridge<br/>... other sites"]
+    end
+
+    subgraph SAF["Store & Forward<br/>(per site, per call)"]
+        Q1["Local Queue"]
+        Q2["Local Queue"]
+        Q3["Local Queue"]
+        QN["Local Queue"]
+    end
+
+    subgraph Redpanda["Redpanda Central Cluster (South Bend)"]
+        direction TB
+        subgraph Topics["Topics: {domain}.{entity}.{event-type}"]
+            T1["equipment.tag.value-changed<br/>⏱ analytics 30d"]
+            T2["equipment.state.transitioned<br/>⏱ analytics 30d"]
+            T3["mes.workorder.started<br/>⏱ analytics 30d"]
+            T4["scada.alarm.raised<br/>⏱ operational 7d"]
+            T5["quality.inspection.completed<br/>⏱ compliance 90d"]
+        end
+        SR["Schema Registry<br/>Protobuf + BACKWARD_TRANSITIVE"]
+        AUTH["SASL/OAUTHBEARER<br/>+ prefix ACLs"]
+    end
+
+    subgraph Consumers["Enterprise Consumers"]
+        SNB["SnowBridge<br/>→ Snowflake"]
+        KPI["KPI Processors"]
+        CAM["Camstar<br/>Integration"]
+        REPLAY["Historical Replay<br/>(simulation-lite)"]
+    end
+
+    SB1 --> Q1 --> T1
+    SB2 --> Q2 --> T2
+    SB3 --> Q3 --> T3
+    SBN --> QN --> T4
+    SR -.->|"validates"| Topics
+    AUTH -.->|"enforces"| Topics
+    T1 --> SNB
+    T2 --> SNB
+    T2 --> KPI
+    T3 --> CAM
+    T1 --> REPLAY
+    T5 --> SNB