[nixos-configs-7hd] Add parallel_beads skill for orchestrating bead processing

- Add skills/ directory for local Claude skills
- Create parallel_beads.md skill that orchestrates:
  - Phase 1: Multi-select bead selection from bd ready
  - Phase 2: Parallel subagents for implementation (worktree, implement, commit, PR)
  - Phase 3: Parallel review subagents
  - Phase 4: Cleanup and summary
- Update default.nix to install local skills alongside humanlayer plugins
- Support both gh (GitHub) and tea (Gitea/Forgejo) based on origin URL

home/home-server.nix

@@ -0,0 +1,24 @@
+{ pkgs, globalInputs, system, ... }:
+
+{
+  # Home Manager configuration for servers (minimal with development tools)
+  home.username = "johno";
+  home.homeDirectory = "/home/johno";
+  home.stateVersion = "24.05";
+
+  # Minimal roles for server with development capability
+  home.roles = {
+    base.enable = true;
+    development.enable = true;
+    tmux.enable = true;
+  };
+
+  targets.genericLinux.enable = true;
+  home.sessionVariables = {};
+  home.sessionPath = [];
+
+  imports = [
+    ./roles
+    ./roles/base-linux
+  ];
+}