Reimplement !drain command

README.md

@@ -47,12 +47,12 @@ kept alive. Edits to connection/bootstrap files are reported as deferred until
 the next manual start, rather than triggering an automatic reconnect.
 
 The 26.3 client now handles AuthMe, chat commands, chunk/world-state caching,
-modern block/item/entity data, entity tracking, read-only inventory/component
-sync, path-following movement (`1goto x y z`), and the crop harvest/replant loop
-(`1farm crops`). General inventory/window actions and the other farming/trading
-jobs remain disabled until their 26.3 packets are migrated. The default server is
-`127.0.0.1`; set `SERVER` explicitly only when you intentionally want another
-server.
+modern block/item/entity data, entity tracking, inventory/component sync,
+path-following movement (`1goto x y z`), inventory draining (`1drain`), and the
+crop harvest/replant loop (`1farm crops`). Other inventory/window actions and
+the farming/trading jobs remain disabled until their 26.3 packets are migrated.
+The default server is `127.0.0.1`; set `SERVER` explicitly only when you
+intentionally want another server.
 
 ## Usage
 
@@ -74,7 +74,7 @@ and all bots will run the command.
 
 The current 26.3 command path handles public chat. Private-message routing is
 not migrated yet. Verified commands are `!ping`, `!pos`, `!loaded`, `!info x y
-z`, `!inv` (basic slot/count data), and addressed path movement such as
+z`, `!inv` (basic slot/count data), `1drain`, addressed path movement such as
 `1goto x y z`, and `1farm crops`. The command catalog below is retained from
 the legacy bot; other inventory actions, arbitrary block interaction, and the
 other farming/trading commands are not yet available on 26.3. Common item