Public repo: .#loop fetches over public HTTPS, README for outsiders

- flake.nix: .#loop runs git+https://gitea.surma.technology/surma/sausage
  (SAUSAGE_FLAKE overrides it); drop loop-internal / --internal (LAN SSH).
- README: clone step, LLM token requirement, loop URL and SAUSAGE_FLAKE.
- ci.yml: comment without internal host name.

README.md

@@ -10,9 +10,11 @@ change its own code.
 
 ## Start
 
-You need [Nix](https://nixos.org/download) with flakes.
+You need [Nix](https://nixos.org/download) with flakes, and an API token for
+an LLM (OpenAI Responses or Anthropic Messages API).
 
 ```sh
+git clone https://gitea.surma.technology/surma/sausage && cd sausage
 nix run -- init     # creates ./world and builds the agent (a few minutes)
 nix run -- run      # starts the world and a console
 ```
@@ -26,12 +28,13 @@ folder as an argument, for example `nix run -- run my-world`.
 To keep a world on the newest version, run it in a loop:
 
 ```sh
-nix run .#loop -- my-world            # or .#loop-internal (Gitea on the LAN)
+nix run .#loop -- my-world
 ```
 
-The loop runs `nix run --refresh git+ssh://…/surma/sausage -- run my-world`.
+The loop runs `nix run --refresh git+https://gitea.surma.technology/surma/sausage -- run my-world`.
 When the host crashes or an actor sends `@broker {"type":"exit"}`, the loop
-fetches the newest commit and starts it again. `/quit` ends the loop.
+fetches the newest commit and starts it again. `/quit` ends the loop. Set
+`SAUSAGE_FLAKE` to run another flake URL instead, for example your fork.
 
 In the console: