Closes#43
FBNeo and Kronos expect BIOS archives in core-specific subdirectories
(system/fbneo/, system/kronos/). RetroArch firmware check uses .info
paths which include these prefixes, so files at root show as Missing.
Add archive_prefix field to emulator profiles. The pack code now places
archive copies in the prefixed subdirectory while keeping root copies
for cores that expect them there (e.g. Geolith for neogeo.zip).
9 new wiki pages: getting-started, faq, troubleshooting,
advanced-usage, verification-modes, adding-a-platform,
adding-a-scraper, testing-guide, release-process.
Updated architecture.md with mermaid diagrams, tools.md with
full pipeline and target/exporter sections, profiling.md with
missing fields, index.md with glossary and nav links.
Expanded CONTRIBUTING.md from stub to full contributor guide.
Filter .old.yml from load_emulator_profiles, generate_db alias
collection, and generate_readme counts. Fix BizHawk sha1 mode
in tools.md, fix RetroPie path, fix export_truth.py typos.
