feat: create new home/ directory structure for profile-based config

New structure:
- home/base/        - Always loaded (shell, cli-tools, secrets)
- home/coding/      - Profile-independent dev tooling (editor, lsp, git, agents)
- home/profiles/    - Freely combinable profiles (gaming, media)
- home/desktop/     - Desktop-only (wm, apps, theme)
- home/server/      - Minimal server stub

Migration sources:
- home/features/cli/ → home/base/{shell,cli-tools,secrets}
- home/features/desktop/hyprland,wayland,rofi → home/desktop/wm/
- home/features/desktop/obsidian,office,webapps,crypto → home/desktop/apps/
- home/features/desktop/fonts,theme,wallpapers → home/desktop/theme/
- gaming.nix split → home/profiles/gaming/{steam,gamescope}
- media.nix split  → home/profiles/media/{obs,ffmpeg,yt-dlp,kdenlive,handbrake}

Option namespaces updated:
- features.cli.*  → base.shell.* / base.cliTools.* / base.secrets
- features.desktop.* → desktop.wm.* / desktop.apps.* / desktop.theme.*
- features.desktop.gaming → profiles.gaming.*
- features.desktop.media  → profiles.media.*

Verified: nix flake check passes (warnings only)

home/coding/agents/agents.nix

@@ -0,0 +1,103 @@
+# AI agent system — OpenCode, Pi, and MCP server configuration.
+# References inputs.m3ta-nixpkgs.homeManagerModules.coding.agents for the base module.
+{
+  config,
+  inputs,
+  lib,
+  pkgs,
+  videoDrivers,
+  ...
+}:
+with lib; let
+  npmGlobalPrefix = "${config.home.homeDirectory}/.npm-global";
+in {
+  home.file.".npmrc".text = ''
+    prefix=${npmGlobalPrefix}
+  '';
+  home.sessionVariables.NPM_CONFIG_PREFIX = npmGlobalPrefix;
+
+  imports = [
+    # OpenCode and Pi agent configurations
+    ../../features/coding/opencode.nix
+    ../../features/coding/pi.nix
+  ];
+
+  coding.agents.skills = {
+    agentsInput = inputs.agents;
+    externalSkills = [
+      {
+        src = inputs.skills-anthropic;
+        selectSkills = ["pdf" "docx" "frontend-design"];
+      }
+      {src = inputs.skills-vercel;}
+      {src = inputs.skills-basecamp;}
+      {src = inputs.skills-kestra;}
+    ];
+  };
+
+  programs.mcp = {
+    enable = true;
+    servers = {
+      DeepWiki = {
+        url = "https://mcp.deepwiki.com/mcp";
+      };
+      Ref = {
+        command = "bash";
+        args = ["-c" "REF_API_KEY=$(cat /run/agenix/ref-key) exec bunx ref-tools-mcp@latest"];
+      };
+      Exa = {
+        command = "bash";
+        args = ["-c" "EXA_API_KEY=$(cat /run/agenix/exa-key) exec bunx exa-mcp-server@latest tools=web_search_exa"];
+      };
+      Outline = {
+        url = "https://wiki.az-gruppe.com/mcp";
+      };
+      ContextMode = {
+        command = "bash";
+        args = ["-c" "exec bunx context-mode@latest"];
+      };
+      Honcho = {
+        command = "bash";
+        args = [
+          "-c"
+          ''exec bunx mcp-remote@latest https://mcp.honcho.dev --header "Authorization:Bearer $(cat /run/agenix/honcho-key)" --header "X-Honcho-User-Name:m3tam3re"''
+        ];
+      };
+    };
+  };
+
+  home.packages = with pkgs; [
+    agenix-cli
+    agent-browser
+    alejandra
+    bc
+    bun
+    devpod
+    gnumake
+    cmake
+    (python3.withPackages (ps:
+      with ps; [
+        pip
+        uv
+        numba
+        numpy
+        torch
+        srt
+      ]))
+    pyrefly
+    nixd
+    nix-update
+    nodejs
+    (qmd.override {
+      vulkanSupport = videoDrivers == ["amdgpu"];
+      cudaSupport = videoDrivers == ["nvidia"];
+    })
+    openshell
+    openspec
+    pi-coding-agent
+    sidecar
+    tailwindcss
+    tailwindcss-language-server
+    td
+  ];
+}

home/coding/default.nix

@@ -0,0 +1,10 @@
+# Coding environment aggregator — profile-independent development tooling.
+# Imports editors, LSP servers, git configuration, and the agent system.
+{...}: {
+  imports = [
+    ./editor
+    ./lsp
+    ./git/git.nix
+    ./agents/agents.nix
+  ];
+}

home/coding/editor/default.nix

@@ -0,0 +1,6 @@
+# Editor aggregator — delegates to m3ta-nixpkgs editors module for NeoVim and Zed.
+{...}: {
+  imports = [
+    ./neovim.nix
+  ];
+}

home/coding/editor/neovim.nix

@@ -0,0 +1,17 @@
+# NeoVim base configuration via m3ta-nixpkgs coding.editors module.
+{
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.coding.editors.neovim;
+in {
+  # coding.editors.neovim is provided by inputs.m3ta-nixpkgs.homeManagerModules.default
+  options.coding.editors.neovim.enable = mkEnableOption "enable NeoVim editor";
+
+  config = mkIf cfg.enable {
+    # NeoVim configuration is managed by the m3ta-nixpkgs coding.editors module.
+    # Additional host-specific overrides can be added here.
+  };
+}

home/coding/git/git.nix

@@ -0,0 +1,41 @@
+# Git configuration with signing, aliases, and global ignore.
+# Identity and host-specific SSH keys are set per-host in home/m3tam3re/.
+{
+  lib,
+  pkgs,
+  ...
+}:
+with lib; {
+  programs.git = {
+    enable = true;
+    signing.format = null;
+    settings = {
+      user = {
+        name = lib.mkDefault "m3tam3re";
+        email = lib.mkDefault "p@m3ta.dev";
+      };
+      core.excludesfile = "~/.gitignore_global";
+      init.defaultBranch = "master";
+      alias = {
+        st = "status";
+        logd = "log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit";
+      };
+    };
+  };
+
+  programs.difftastic.enable = true;
+
+  programs.jujutsu = {
+    enable = true;
+    settings = {
+      user = {
+        email = "m@m3tam3re.com";
+        name = "Sascha Koenig";
+      };
+    };
+  };
+
+  home.packages = with pkgs; [
+    lazygit
+  ];
+}

home/coding/lsp/default.nix

@@ -0,0 +1,6 @@
+# LSP aggregator — language server protocol tooling.
+{...}: {
+  imports = [
+    ./servers.nix
+  ];
+}

home/coding/lsp/servers.nix

@@ -0,0 +1,22 @@
+# LSP server configuration — language servers for the development environment.
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.coding.lsp;
+in {
+  options.coding.lsp.enable = mkEnableOption "enable LSP servers";
+
+  config = mkIf cfg.enable {
+    home.packages = with pkgs; [
+      # Nix
+      nixd
+      # General
+      nodePackages.typescript-language-server
+      tailwindcss-language-server
+    ];
+  };
+}