Add Reticulum/LXMF integration for Home Assistant

Custom integration connecting Home Assistant to a Reticulum network over a
TCPClientInterface and exchanging LXMF messages, with an Assist conversation
bridge, notify entity, sensors (incl. interface telemetry), buttons, services,
bus events and device triggers.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

custom_components/reticulum/manifest.json

@@ -0,0 +1,16 @@
+{
+  "domain": "reticulum",
+  "name": "Reticulum",
+  "codeowners": [],
+  "config_flow": true,
+  "dependencies": [],
+  "after_dependencies": ["conversation"],
+  "documentation": "https://github.com/tewris/ha-reticulum",
+  "integration_type": "hub",
+  "iot_class": "local_push",
+  "issue_tracker": "https://github.com/tewris/ha-reticulum/issues",
+  "loggers": ["RNS", "LXMF"],
+  "requirements": ["rns>=0.9.0", "lxmf>=0.6.0"],
+  "single_config_entry": true,
+  "version": "1.0.0"
+}