README: add a Works Well With section linking related plugins

[dmccoystephenson]

A "Works Well With" section is added to the README so that server owners who find Medieval-Roleplay-Engine can discover the related Dan's Plugins. It follows the cross-promotion pass applied to Medieval Factions in Dans-Plugins/Medieval-Factions#2061.

The plugins are grouped into two sets:

• Medieval roleplay, centred on Medieval Roleplay Engine: Medieval Factions, Mailboxes, Medieval Economy, PlayerLore, Medieval Cookery, Conquest Recipes.
• Survival flavour: Food Spoilage, Wild Pets, SimpleSkills, More Recipes, Medieval Cookery.

Each entry links the GitHub repository, the SpigotMC page where one exists, and the /dpm get <name> command. The names were taken from Dan's Plugin Manager's registry (ProjectRecordInitializer, same in v0.6.0), which uses joined lowercase names such as medievalroleplayengine, not the hyphenated dansplugins.com slugs. Medieval Cookery has no stable release and no SpigotMC page, and it is listed as such.

Only true claims are made. The source of every listed plugin was checked for calls into the others:

• The only code integration among these plugins is Medieval Factions delivering faction notifications through Mailboxes when Mailboxes is installed (MailboxesNotificationService, in MF v7.0.0).
• Medieval Roleplay Engine declares softdepend: [PlaceholderAPI, MedievalFactions, Mailboxes], but only PlaceholderAPI is called from its code; the other two affect load order only.
• None of the other plugins references another Dan's Plugin in code or in plugin.yml. They are thematic companions, and the README says so.
• In this README, Medieval Factions and Mailboxes are moved out of "Optional Integrations" (which now lists only PlaceholderAPI, the one real integration) into the new section, which states that they are soft dependencies the plugin does not call into. Medieval Factions is named as the companion factions plugin, with a link to its Expansions section.

README-only change; line endings are preserved.

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drafted by Claude on behalf of Daniel Stephenson

🤖 Generated with Claude Code

https://claude.ai/code/session_01JsSSKgsNcjNtbQpnvuzB1r