Co-op research

• Search with several phrasings and in the fan base's languages; GitHub code, repos, forks and non-default branches; ModDB, Nexus, archive.org, Steam guides, Reddit, the game's Discord.
• Never report "nothing exists" without listing what was searched. Write searched: notes.
• For each find: link, author handle, license, last confirmed activity, what it really syncs (players visible, story, enemies, world, items), where bug reports live, newest build verified by hash or version string.
• Bug reports from Discord: follow playbook/discord-export.md (Terms of Service first, never handle tokens in chat).
• Add or correct entries in data/directory.yaml, run python tools/build_directory.py.

Details: playbook/research.md, playbook/engine-families.md.