tests/__init__.py keeps a run offline, its scratch under tmp/ and its
installer cache its own, but only discover -s tests -t . imported it.
discover tests ran with RETROBIOS_OFFLINE unset, scratch on the /tmp
tmpfs and the user's real installer cache, the setting in which e2e
fixtures had written into the shared .cache/large. Every test module now
imports the package first, and a test fails on a module that does not.
test_verify_listing.py took its line with the previous commit.
The scraper reads each component's prepare, launcher and functions scripts at the components commit the BIOS list comes from, and the presets they copy: the fixed paths set_setting_value writes (melonDS seven, xemu three, Dolphin GBA), the folders handed over, the dir_prep links (LRPS2 pcsx2/bios back to bios/, Dolphin and PrimeHack GC regions under saves/), package copies into bios/, RetroArch core options naming a file (pcsx2_bios, DuckStation per region), XRoar romlists, the PICO-8 exec and the RPCS3 and Vita3K firmware downloads.
platforms/retrodeck.yml is regenerated at fcd0d729: only the launchers section is new.