feat(irc): add interactive setup

feat(gateway): refine Platform._missing_ and platform-connected dispatch

Restricts plugin-name acceptance to bundled plugin scan + registry
(no arbitrary string -> enum-pollution), pulls per-platform connectivity
checks into a _PLATFORM_CONNECTED_CHECKERS lambda map with a clean
_is_platform_connected method, and adds tests covering the checker map,
plugin platform interface, and IRC setup wizard.

gateway/stream_consumer.py

@@ -854,6 +854,81 @@ class GatewayStreamConsumer:
         self._final_response_sent = True
         return True
 
+    def _should_send_fresh_final(self) -> bool:
+        """Return True when a long-lived preview should be replaced with a
+        fresh final message instead of an edit.
+
+        Conditions:
+        - Fresh-final is enabled (``fresh_final_after_seconds > 0``).
+        - We have a real preview message id (not the ``__no_edit__`` sentinel
+          and not ``None``).
+        - The preview has been visible for at least the configured threshold.
+
+        Ported from openclaw/openclaw#72038.
+        """
+        threshold = getattr(self.cfg, "fresh_final_after_seconds", 0.0) or 0.0
+        if threshold <= 0:
+            return False
+        if not self._message_id or self._message_id == "__no_edit__":
+            return False
+        if self._message_created_ts is None:
+            return False
+        age = time.monotonic() - self._message_created_ts
+        return age >= threshold
+
+    async def _try_fresh_final(self, text: str) -> bool:
+        """Send ``text`` as a brand-new message (best-effort delete the old
+        preview) so the platform's visible timestamp reflects completion
+        time.  Returns True on successful delivery, False on any failure so
+        the caller falls back to the normal edit path.
+
+        Ported from openclaw/openclaw#72038.
+        """
+        old_message_id = self._message_id
+        try:
+            result = await self.adapter.send(
+                chat_id=self.chat_id,
+                content=text,
+                metadata=self.metadata,
+            )
+        except Exception as e:
+            logger.debug("Fresh-final send failed, falling back to edit: %s", e)
+            return False
+        if not getattr(result, "success", False):
+            return False
+        # Successful fresh send — try to delete the stale preview so the
+        # user doesn't see the old edit-stuck message underneath.  Cleanup
+        # is best-effort; platforms that don't implement ``delete_message``
+        # just leave the preview behind (still an acceptable outcome —
+        # the visible final timestamp is the important part).
+        if old_message_id and old_message_id != "__no_edit__":
+            delete_fn = getattr(self.adapter, "delete_message", None)
+            if delete_fn is not None:
+                try:
+                    await delete_fn(self.chat_id, old_message_id)
+                except Exception as e:
+                    logger.debug(
+                        "Fresh-final preview cleanup failed (%s): %s",
+                        old_message_id, e,
+                    )
+        # Adopt the new message id as the current message so subsequent
+        # callers (e.g. overflow split loops, finalize retries) see a
+        # consistent state.
+        new_message_id = getattr(result, "message_id", None)
+        if new_message_id:
+            self._message_id = new_message_id
+            self._message_created_ts = time.monotonic()
+        else:
+            # Send succeeded but platform didn't return an id — treat the
+            # delivery as final-only and fall back to "__no_edit__" so we
+            # don't try to edit something we can't address.
+            self._message_id = "__no_edit__"
+            self._message_created_ts = None
+        self._already_sent = True
+        self._last_sent_text = text
+        self._final_response_sent = True
+        return True
+
     async def _send_or_edit(self, text: str, *, finalize: bool = False) -> bool:
         """Send or edit the streaming message.