Add test script (in mere Edh) for the world

[complyue]

It's easily mocked up with just ap/agent sinks to test-run a chat world without actual websockets, from a bare Edh shell (edhi).

Just some code in edh_modules/chat-test.edh to make the following transcript work:

$ edhi
>> Bare Đ (Edh) Interpreter <<
* Blank Screen Syndrome ? Take the Tour as your companion, checkout:
  https://github.com/e-wrks/edh/Tour/
Đ: import (TestChat, **_) 'chat-test'
* 😱 *
💔
📜 <interactive> 🔎 <adhoc>:1:1
💣 No such module: chat-test
👉 <interactive>:1:1
Đ: TestChat()
* 😱 *
💔
📜 <interactive> 🔎 <adhoc>:1:1
💣 Not in scope: NamedAttr "TestChat"
👉 <interactive>:1:1
Đ: