Add QR pairing (terminal QR, in-app scanner, iris://pair deep link)

gateway-plugin/purge.py

@@ -1,6 +1,6 @@
-"""Complete (hard) deletion of android messages from the hermes session store.
+"""Complete (hard) deletion of iris messages from the hermes session store.
 
-The android plugin mints its own message ids (``m_<hex>``) that are **not**
+The iris plugin mints its own message ids (``m_<hex>``) that are **not**
 persisted in the hermes session DB (``state.db``), so a delete request cannot
 join on an id. Instead a message is matched to its ``messages`` row by
 (session, role, content, timestamp proximity) and that row is deleted.
@@ -89,7 +89,7 @@ def delete_lane(db_path: Path, chat_id: str, thread_id: str | None = None) -> in
         conn.commit()
         return n_msgs
     except sqlite3.Error as e:
-        logger.warning("android purge: delete_lane failed: %s", e)
+        logger.warning("iris purge: delete_lane failed: %s", e)
         return 0
     finally:
         with contextlib.suppress(Exception):
@@ -148,7 +148,7 @@ def delete_message(
         conn.commit()
         return 1
     except sqlite3.Error as e:
-        logger.warning("android purge: delete_message failed: %s", e)
+        logger.warning("iris purge: delete_message failed: %s", e)
         return 0
     finally:
         with contextlib.suppress(Exception):