Fixture plugin for Playwright coverage. It calls every public Toju plugin API surface, registers UI contributions, writes storage, publishes events, creates plugin user data, imports attachments/messages, exercises typing APIs, and logs completion.

It also registers two / slash commands: /e2e-echo <message> (server scope, echoes text back into the channel) and /e2e-ping (global scope, logs a pong), exercising api.commands.register / api.commands.list.