Document private MQTT topics and the 1.1 upgrade

CHANGELOG.md

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+# Changelog
+
+## 1.1 — 2026-10-03
+
+- Full command, state and availability topics are required in the private INI.
+- Subscription, state publication, availability and Last Will use those settings.
+- Generic shared topic examples; no installation-specific topic prefixes in the current source.
+- MQTT client ID can also be configured in the INI.
+- Missing, blank, duplicate, wildcard and oversized topics are rejected at startup.
+- Upgrade instructions preserve existing topics and the existing Home Assistant entity.
+- 24 behaviour/configuration tests with mocked MQTT and Docker.
+
+## 1.0 — 2026-10-03
+
+- MQTT-controlled handover between MeshCore WebUI and a native phone app.
+- Independent systemd controller; stops/starts only `meshcore-webui`.
+- Confirmed Docker state, retained JSON and MQTT availability/Last Will.
+- Automatic MQTT reconnect without changing container state.
+- Non-retained ON/OFF commands and idempotent container operations.
+- Home Assistant package, Debian installer and example credentials config.
+- 16 behaviour tests; initial installation and switching confirmed working.