Module download 

Functions

build_tree 🔒 ^⚠

Rebuilds the model from the catalogue, the cache and the game folder’s ledger, and shows it.

describe_schema_mismatch 🔒

The modal is short; this is what the user can send back.

download_page^⚠

Scene 4: the catalogue as a tree, checked by what the user wants this run.

load_tree 🔒

The model alone, which the Configure route needs for scene 5 though it never shows scene 4’s tree control.

on_download 🔒 ^⚠

Every choice category in the tree needs a pick, and a build too old for the catalogue stops only when something must come down the wire, so it can still reconfigure and remove; scene 4b does the transfers.

on_worker_done 🔒 ^⚠

A failed fetch is not fatal: the tree falls back to what is already cached.

schema_mismatch 🔒

Checked only on a manifest the server sent, so an offline run is never told it is out of date; the reason goes to the run log.

start_catalogue_fetch 🔒 ^⚠

Once per run, and whatever /health said: it is a convenience for scene 2’s status line, and a hiccup there, or an answer still on its way, must not hide a catalogue that would have come back (D12). A failed fetch builds the tree from the cache alone.