fix: show and count data archive downloads

A data tree's archive came with no progress line, and the run ended on the BIOS bytes alone (310.5 KB where 82 MB arrived). Its download now draws the progress line and adds its bytes and time to the end line, a cut attempt taken back. It writes no progress event: those count the download event's files.

scripts/generate_installer_doc.py

@@ -362,7 +362,8 @@ def _child(spec: dict) -> int:
     def held(files: list[dict], _bios: Path, **_kwargs: object) -> tuple:
         return [], list(files), []
 
-    def tree_landed(entry: dict, _bios: Path, state: object = None) -> dict:
+    def tree_landed(entry: dict, _bios: Path, state: object = None,
+                    _progress: object = None) -> dict:
         return {"present": 0, "installed": len(entry["files"]), "changed": 0,
                 "absent": 0, "error": "", "not_kept": []}