Document how chat templates carry tools and data sources

app/MindWork AI Studio/Plugins/assistants/plugin.lua

@@ -454,12 +454,18 @@ ASSISTANT = {
     ["ProviderId"] = "<optional provider GUID; omit to use the chat default>",
     ["ProfileId"] = "<optional profile GUID; use the empty GUID for no profile>",
     ["ChatTemplateId"] = "<optional chat template GUID; use the empty GUID for no template>",
+    -- Optional: the data sources the chat starts with. A chat template chosen above may bring
+    -- data source options of its own. It then decides them alone, the IDs named here are dropped,
+    -- and AI Studio writes a warning into the log. Only a chat template can also say that the AI
+    -- picks the sources for each message, which is why it wins as a whole instead of field by
+    -- field.
     ["DataSourceIds"] = {
         "<optional data source GUID>",
     },
     -- Optional: the tools preselected when the chat opens. Users may change the selection
     -- in the chat afterwards, and every tool has to meet the confidence requirements of the
-    -- provider in use. A tool ID unknown to the installation is ignored.
+    -- provider in use. A tool ID unknown to the installation is ignored. The same rule as for the
+    -- data sources applies here: a chat template which names tools of its own wins over this list.
     -- Tool IDs include: web_search, read_web_page
     ["ToolIds"] = {
         "<optional tool ID>",