chore: optimize hermes

hosts/m3-hermes/services/hermes-agent.nix

@@ -16,7 +16,7 @@
   gccLibPath = "${pkgs.stdenv.cc.cc.lib}/lib";
 
   # Build skills using agents flake lib for hermes user
-  hermesSkills = inputs.agents.lib.mkOpencodeSkills {
+  hermesSkills = inputs.agents.lib.mkSkills {
     inherit pkgs;
     customSkills = "${inputs.agents}/skills";
     externalSkills = [
@@ -79,7 +79,13 @@ in {
     enable = true;
     addToSystemPackages = true;
 
-    extraPackages = with pkgs; [docker git tea nix];
+    extraPackages = with pkgs; [
+      docker
+      git
+      tea
+      nix
+      zellij
+    ];
 
     # Secrets via agenix
     environmentFiles = [
@@ -240,6 +246,9 @@ in {
         user_id = "@chiron:m3ta.dev";
         allowed_users = ["@m3tam3re:m3ta.dev"];
         encryption = true;
+        group_sessions_per_user = true;
+        auto_thread = true;
+        dm_mention_threads = true;
       };
 
       # ── Approvals / Security ───────────────────────────────────────────