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/scadabridge-dataflow.mmd

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+flowchart LR
+    subgraph Inputs["Data Inputs"]
+        OT["OtOpcUa<br/>Equipment NS"]
+        SP["OtOpcUa<br/>System Platform NS"]
+    end
+
+    subgraph ScadaBridge["ScadaBridge Cluster (per site)"]
+        direction TB
+        TPL["Templates<br/>(central DB → site push)"]
+        SCR["Scripts<br/>(C# Roslyn)"]
+        SAF["Store & Forward<br/>(per-call, optional)"]
+        subgraph Internals["Akka.NET Runtime"]
+            SUP["Supervision<br/>(self-healing)"]
+            CLST["2-node cluster<br/>(~25s failover)"]
+        end
+    end
+
+    subgraph Outputs["Integration Targets"]
+        RED["Redpanda EventHub<br/>(committed, Year 1)"]
+        API["External Web APIs<br/>(pre-configured, generic)"]
+        DB["SQL Server<br/>(batch tracking)"]
+        NOT["Email Notifications<br/>(contact-list driven)"]
+        EQ["Equipment Writes<br/>(OPC UA via OtOpcUa)"]
+        CAM["Camstar MES<br/>(direct Web API)"]
+    end
+
+    OT --> SCR
+    SP --> SCR
+    TPL --> SCR
+    SCR --> SAF
+    SAF --> RED
+    SAF --> API
+    SAF --> DB
+    SAF --> NOT
+    SCR --> EQ
+    SCR --> CAM