Merge feature/home-profile-restructuring: home-manager profile refactoring

Refactor home-manager configuration structure:
- Reorganize from features/ to base/coding/desktop/server/profiles/
- Add language runtime modules (go, js, python, rust, typescript)
- Add LSP server configuration
- Add gaming and media profiles
- Add shell modules (fish, nushell, starship)
- Consolidate editor and git configuration

home/coding/agents/agents.nix

@@ -0,0 +1,74 @@
+# AI agent system — OpenCode, Pi, and MCP server configuration.
+# Relies on coding.agents options provided by home/common/default.nix
+# (inputs.m3ta-nixpkgs.homeManagerModules.default).
+{
+  config,
+  inputs,
+  lib,
+  pkgs,
+  videoDrivers ? [],
+  ...
+}: {
+  imports = [
+    # OpenCode and Pi agent configurations
+    ./opencode.nix
+    ./pi.nix
+  ];
+
+  coding.agents.skills = {
+    agentsInput = inputs.agents;
+    externalSkills = [
+      {
+        src = inputs.skills-anthropic;
+        selectSkills = ["pdf" "docx" "frontend-design"];
+      }
+      {src = inputs.skills-superpowers;}
+      {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
+    pyrefly
+    (qmd.override {
+      vulkanSupport = videoDrivers == ["amdgpu"];
+      cudaSupport = videoDrivers == ["nvidia"];
+    })
+    openshell
+    openspec
+  ];
+}