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/__init__.py

@@ -34,7 +34,6 @@ from .const import (
     CONF_ASSIST_LANGUAGE,
     CONF_DISPLAY_NAME,
     CONF_ENABLE_ASSIST,
-    CONF_GREETING,
     CONF_INTERFACE_NAME,
     CONF_LOGLEVEL,
     CONF_PROPAGATION_NODE,
@@ -80,8 +79,6 @@ class RuntimeData:
         # Maps a peer address -> the HA conversation_id we opened for it, so
         # each remote user keeps its own Assist conversation context.
         self.conversation_ids: dict[str, str] = {}
-        # Senders we've already greeted this session (first-contact greeting).
-        self.greeted: set[str] = set()
 
 
 async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
@@ -238,12 +235,6 @@ def _make_incoming_handler(
             _LOGGER.debug("Ignoring message from non-allowed sender %s", source)
             return
 
-        # First-contact greeting: send the configured greeting once per sender.
-        greeting = (options.get(CONF_GREETING) or "").strip()
-        if greeting and source not in runtime.greeted:
-            runtime.greeted.add(source)
-            await _reply(runtime.manager, source, greeting, "Home Assistant")
-
         if not options.get(CONF_ENABLE_ASSIST, True):
             return