Core and BMM modules live in this repo (src/core-skills, src/bmm-skills)
but the installer UI sourced them from the remote registry. When the
registry was unreachable (VPN, proxy, firewall), the fallback YAML only
had the 4 external modules, so core and bmm disappeared from the install
list entirely.
Now _selectOfficialModules and getDefaultModules always read built-in
modules from the local source via OfficialModules.listAvailable(), then
append external modules from the registry. Network failures only affect
external modules.
Closes#2239
83f374c254