feat(herdr): declare config in home-manager and persist state

home/base/gui/dev-tools.nix

@@ -18,6 +18,5 @@
 
       # Utilities
       rtk # CLI proxy that reduces LLM token consumption
-      herdr # Terminal workspace manager for AI coding agents
     ]);
 }

home/base/tui/herdr.nix

@@ -0,0 +1,42 @@
+{
+  pkgs,
+  lib,
+  llm-agents,
+  ...
+}:
+{
+  programs.herdr = {
+    enable = true;
+    package = llm-agents.packages.${pkgs.stdenv.hostPlatform.system}.herdr;
+
+    settings = {
+      onboarding = false;
+
+      update = {
+        version_check = false;
+        manifest_check = false;
+      };
+
+      # home-manager owns ~/.ssh/config; keep herdr from writing it too.
+      remote.manage_ssh_config = false;
+
+      # "catppuccin" is the mocha flavor, matching catppuccin-nix's fixed flavor.
+      theme.name = "catppuccin";
+
+      terminal = {
+        default_shell = lib.getExe pkgs.nushell;
+        shell_mode = "auto";
+        new_cwd = "follow";
+      };
+
+      ui = {
+        agent_panel_sort = "priority";
+        prompt_new_tab_name = false;
+        sound.enabled = false;
+      };
+
+      session.resume_agents_on_restore = true;
+      experimental.kitty_graphics = true;
+    };
+  };
+}

hosts/idols-ai/preservation.nix

@@ -164,6 +164,10 @@ in
         ".local/share/opencode"
         ".local/state/opencode"
 
+        # herdr: plugin registry, plugin checkouts/config, session layout
+        ".config/herdr"
+        ".local/state/herdr"
+
         ".context7" # up-to-date docs and code examples for for LLMs & agents
 
         # nvim