feat(glyph): use enableMcpIntegration for opencode

Replace manually-defined mcp.glyph in opencode settings with
enableMcpIntegration, picking up the shared programs.mcp.servers config.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: stackptr

hosts/glyph/home.nix

@@ -9,6 +9,7 @@
 
   programs.opencode = {
     enable = true;
+    enableMcpIntegration = true;
     web.enable = true;
     web.extraArgs = ["--port" "8890" "--hostname" "0.0.0.0"];
     rules = builtins.readFile "${llm-profile}/README.md";
@@ -22,10 +23,6 @@
         port = 8890;
         hostname = "0.0.0.0";
       };
-      mcp.glyph = {
-        type = "remote";
-        url = "http://127.0.0.1:8090/mcp";
-      };
     };
   };