Remove the greeting feature entirely

Drops the CONF_GREETING option, the first-contact greeting logic and its
RuntimeData state, and all related strings/translations/README text. Any
greeting value left in an existing entry's options is simply ignored.

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

custom_components/reticulum/config_flow.py

@@ -41,7 +41,6 @@ from .const import (
     CONF_DELIVERY_METHOD,
     CONF_DISPLAY_NAME,
     CONF_ENABLE_ASSIST,
-    CONF_GREETING,
     CONF_INTERFACE_NAME,
     CONF_LOGLEVEL,
     CONF_PROPAGATION_NODE,
@@ -195,10 +194,6 @@ class ReticulumOptionsFlow(OptionsFlow):
                         "suggested_value": opts.get(CONF_DEFAULT_RECIPIENT, "")
                     },
                 ): TextSelector(),
-                vol.Optional(
-                    CONF_GREETING,
-                    description={"suggested_value": opts.get(CONF_GREETING, "")},
-                ): TextSelector(TextSelectorConfig(multiline=True)),
                 vol.Required(
                     CONF_DELIVERY_METHOD,
                     default=opts.get(CONF_DELIVERY_METHOD, DEFAULT_DELIVERY_METHOD),