Enable OpenCode and add its configuration

Enable the OpenCode service on both desktop and laptop hosts.
Import the opencode module into the home configuration and provide
settings, plugins, extra packages, and skill definitions for full
functionality.

hosts/Garand-Desktop/home-modules.nix

@@ -7,7 +7,7 @@ _: {
     enable = true; # Zed Editor: a modern, high‑performance code editor
     remote-server.enable = false; # Remote Server: enable remote editing capabilities
   };
-  opencode.enable = false; # OpenCode: terminal coding agent
+  opencode.enable = true; # OpenCode: terminal coding agent
   codex.enable = true; # Codex: Lightweight coding agent that runs in your terminal
   ollama.enable = false; # Ollama: Local Llms
 

hosts/Garand-Laptop/home-modules.nix

@@ -7,7 +7,7 @@ _: {
     enable = true; # Zed Editor: a modern, high‑performance code editor
     remote-server.enable = false; # Remote Server: enable remote editing capabilities
   };
-  opencode.enable = false; # OpenCode: terminal coding agent
+  opencode.enable = true; # OpenCode: terminal coding agent
   codex.enable = true; # Codex: Lightweight coding agent that runs in your terminal
   ollama.enable = false; # Ollama: Local Llms