refactor!: switch to dendritic pattern

BREAKING CHANGE: complete reorganization of the repository

modules/home/dev/ai/ai.nix

@@ -0,0 +1,50 @@
+{config, ...}: let
+  m = config.flake.modules.homeManager;
+in {
+  flake.modules.homeManager.ai = {
+    config,
+    lib,
+    pkgs,
+    ...
+  }:
+    with lib; let
+      cfg = config.home.dev.ai;
+      jsonFormat = pkgs.formats.json {};
+    in {
+      imports = [
+        m.claude
+        m.ollama
+        m.opencode
+      ];
+
+      options.home.dev.ai = {
+        enable = mkEnableOption "Enables AI features";
+        lmStudio = mkOption {
+          default = cfg.enable;
+          example = true;
+          description = "Enables LM Studio. Enabled by default when AI is enabled.";
+        };
+        mcpServers = mkOption {
+          inherit (jsonFormat) type;
+          default = {};
+        };
+      };
+      config = {
+        home = mkIf cfg.enable {
+          dev.ai = {
+            claude = {
+              enable = mkDefault cfg.enable;
+              mcpServers = mkDefault cfg.mcpServers;
+            };
+            ollama.enable = mkDefault cfg.enable;
+            opencode.enable = mkDefault cfg.enable;
+          };
+          packages = lists.optional cfg.lmStudio pkgs.lmstudio;
+        };
+        programs.mcp = mkIf (cfg.mcpServers != {}) {
+          enable = true;
+          servers = cfg.mcpServers;
+        };
+      };
+    };
+}

modules/home/dev/ai/claude.nix

@@ -0,0 +1,30 @@
+{
+  flake.modules.homeManager.claude = {
+    config,
+    lib,
+    pkgs,
+    ...
+  }:
+    with lib; let
+      cfg = config.home.dev.ai.claude;
+      jsonFormat = pkgs.formats.json {};
+    in {
+      options.home.dev.ai.claude = {
+        enable = mkEnableOption "Enables Claude-related packages";
+        mcpServers = mkOption {
+          inherit (jsonFormat) type;
+          default = {};
+        };
+      };
+      config = mkIf cfg.enable {
+        home.packages = let
+          claude-jj = pkgs.writeShellScriptBin "claude-jj" ''
+            ${pkgs.claude-code}/bin/claude --append-system-prompt 'CRITICAL: This repository uses Jujutsu (jj), NOT git. Never use git commands. Use jj equivalents.' "$@"
+          '';
+        in [claude-jj pkgs.sox];
+        programs.claude-code = {
+          inherit (cfg) enable mcpServers;
+        };
+      };
+    };
+}

modules/home/dev/ai/ollama.nix

@@ -0,0 +1,34 @@
+{
+  flake.modules.homeManager.ollama = {
+    config,
+    lib,
+    ...
+  }:
+    with lib; let
+      cfg = config.home.dev.ai.ollama;
+    in {
+      options.home.dev.ai.ollama = {
+        enable = mkEnableOption "Enables Ollama";
+        gpu = mkOption {
+          type = types.nullOr (types.enum [false "rocm" "cuda"]);
+          example = "rocm";
+          default = null;
+          description = "Which type of GPU should be used for hardware acceleration";
+        };
+      };
+
+      config = {
+        services.ollama = mkIf cfg.enable {
+          inherit (cfg) enable;
+          acceleration = cfg.gpu;
+          host = "0.0.0.0";
+          environmentVariables = {
+            OLLAMA_CONTEXT_LENGTH = "8192";
+            OLLAMA_MAX_LOADED_MODELS = "1";
+            OLLAMA_KEEP_ALIVE = "10m";
+          };
+        };
+        home.sessionVariables.OLLAMA_API_BASE = "http://${config.services.ollama.host}:11434/";
+      };
+    };
+}

modules/home/dev/ai/opencode.nix

@@ -0,0 +1,102 @@
+{
+  flake.modules.homeManager.opencode = {
+    config,
+    lib,
+    pkgs,
+    bunBaseline,
+    ...
+  }:
+    with lib; let
+      cfg = config.home.dev.ai.opencode;
+
+      # On x86_64-linux CPUs without AVX2, use the baseline bun variant
+      # when building opencode - the regular `bun` from nixpkgs requires
+      # AVX2 and crashes on older hardware, such as my Thinkpad x220’s
+      # Intel Core i5 2640M.
+      needsBaselineBun =
+        pkgs.stdenv.hostPlatform.isx86_64 && !pkgs.stdenv.hostPlatform.avx2Support;
+
+      defaultPackageCli =
+        if needsBaselineBun
+        then pkgs.opencode.override {bun = bunBaseline;}
+        else pkgs.opencode;
+
+      defaultPackageDesktop =
+        if needsBaselineBun
+        then pkgs.opencode-desktop.override {bun = bunBaseline;}
+        else pkgs.opencode-desktop;
+
+      corsList = domains: lists.remove "" (lists.forEach (strings.splitString "," domains) trim);
+    in {
+      options.home.dev.ai.opencode = {
+        enable = mkEnableOption "Enables OpenCode";
+        package = mkOption {
+          type = types.package;
+          default = defaultPackageCli;
+          description = "The CLI package for OpenCode";
+        };
+        settings = mkOption {
+          type = types.json;
+          default = {};
+        };
+        tui = mkOption {
+          type = types.json;
+          default = {};
+        };
+        desktop = {
+          enable = mkEnableOption "Enables the desktop app";
+          package = mkOption {
+            type = types.package;
+            default = defaultPackageDesktop;
+            description = "The desktop package for OpenCode";
+          };
+        };
+        web = {
+          enable = mkEnableOption "Enables OpenCode web";
+          extraArgs = mkOption {
+            type = types.listOf types.str;
+            default = [];
+            example = [
+              "--hostname"
+              "0.0.0.0"
+            ];
+          };
+          cors = mkOption {
+            type = types.nullOr (types.either types.str types.path);
+            default = null;
+            example = "opencode.example.com,code.example.com";
+            description = ''
+              Either a string containing the domain allowed to connect to OpenCode’s web instance, or a file containing the target value. The latter is useful when using secret management if you don’t want to publicize the hostname of your OpenCode instance.
+
+              If you want to use multiple domains, you can separate them with a comma.
+            '';
+          };
+          mdns = {
+            enable = mkEnableOption "Enables mDNS with OpenCode";
+            hostname = mkOption {
+              type = types.nullOr types.str;
+              default = null;
+              example = "opencode.local";
+            };
+          };
+        };
+      };
+      config.programs.opencode = mkIf cfg.enable {
+        inherit (cfg) enable tui package;
+        enableMcpIntegration = true;
+        extraPackages = with pkgs; [uv] ++ lists.optional cfg.desktop.enable cfg.desktop.package;
+        settings =
+          {
+            server = mkIf cfg.web.mdns.enable {
+              mdns = true;
+              mdnsDomain = mkIf (cfg.web.mdns.hostname != null) cfg.web.mdns.hostname;
+              cors = corsList cfg.web.cors;
+            };
+          }
+          // cfg.settings;
+        web = {
+          inherit (cfg.web) enable extraArgs;
+        };
+      };
+    };
+}