Add thermo history Helm chart

README.md

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+# Thermo
+
+Helm chart for storing home sensor events from Kafka in PostgreSQL.
+
+The chart deploys:
+
+- PostgreSQL with persistent storage;
+- a generic event and measurement schema suitable for WindFree and BLE sensors;
+- a read-only database role for Grafana;
+- a lightweight Redpanda Connect consumer for `application.thermo.events`;
+- External Secrets backed by the existing AWS SSM secret store.
+
+## Required SSM parameters
+
+- `/vulcan/platform-core/thermo-postgres/writer-password`
+- `/vulcan/platform-core/thermo-postgres/reader-password`
+
+## Validation
+
+```shell
+helm lint .
+helm template thermo . --namespace platform-core
+```
+
+The Grafana datasource and dashboards are intentionally managed outside this chart because Grafana runs in the `monitoring` namespace.