feat(wisdom): introduce wisdomSimpleSlice helper for package modules

Implement a `wisdomSimpleSlice` helper in `desktop/options.nix` to reduce
boilerplate for simple Home Manager modules that only manage packages.
This helper handles the `enable` option creation, platform-gating via
`availableOn`, and conditional inclusion in `home.packages`.

Refactor several existing wisdom modules to use this new helper:
- `wisdomBrowsersChrome`
- `wisdomBrowsersEdge`
- `wisdomEditorsKate`
- `wisdomEditorsObsidian`

Additionally, clean up `wisdom/default.nix` by removing the explicit
import of `wisdomShellBash` (which is now handled via auto-wiring) and
improving code formatting.

docs/conventions.md

@@ -172,7 +172,9 @@ The integration block at the bottom of `modules/system/users.nix` turns the cata
 
 **New NixOS leaf:** export `flake.nixosModules.whatever`, wire from `system/default.nix` or `desktop/default.nix` if it's global, or only from a host `configuration.nix` if it's not. `nix flake check`. Git-add new paths if eval uses the git tree.
 
-**New HM slice:** add `modules/wisdom/.../foo.nix` exporting `flake.homeManagerModules.wisdomFoo` (import-tree picks it up; `wisdomCatalogExtraModules` includes every `wisdom*` export except `wisdom` / `wisdomShellBash`). Gate packages on `chiasson.home.*.enable`, and set the slice's own `enable` default (`mkEnableOption "…" // { default = true/false }`) in that same module — defaults live with the option that owns them, not in a shared defaults file. Hosts flip toggles in `home.nix`. Upstream HM deps stay imported unconditionally — use `mkIf` on `cfg.enable` for config (never `config`-dependent `imports`; that recurses).
+**New HM slice:** add `modules/wisdom/.../foo.nix` exporting `flake.homeManagerModules.wisdomFoo` (import-tree picks it up; `wisdomCatalogExtraModules` includes every `wisdom*` export). Every `wisdom*` slice auto-catalogs — including the bash shell — so the root module no longer manually `imports` it. Gate packages on `chiasson.home.*.enable`, and set the slice's own `enable` default with `mkEnableOption "…" // { default = true/false }` in that same module — defaults live with the option that owns them, not in a shared defaults file. Hosts flip toggles in `home.nix`. Upstream HM deps stay imported unconditionally — use `mkIf` on `cfg.enable` for config (never `config`-dependent `imports`; that recurses).
+
+**Trivial single-package slice:** use `self.lib.wisdomSimpleSlice { path = "a.b"; default = true/false; description = "…"; packages = pkgs: [ … ]; }` instead of the `root`/`cfg` + `mkIf (root.enable && cfg.enable)` boilerplate. `packages` is a `pkgs -> [ drv ]` function responsible for its own `availableOn`/platform gating. Several such slices may share one `simple.nix` in their category dir (each still exporting its own `wisdom*` module), rather than one file per slice.
 
 **Derivations:** `let` inside a fragment, or `flake.packages` / `flake.lib` — not a bare `mkDerivation` file import-tree will try to load.
 

modules/desktop/options.nix

@@ -7,13 +7,33 @@
     self:
     let
       names = lib.sort builtins.lessThan (
-        lib.filter (n: lib.hasPrefix "wisdom" n && n != "wisdom" && n != "wisdomShellBash") (
+        lib.filter (n: lib.hasPrefix "wisdom" n && n != "wisdom") (
           builtins.attrNames self.homeManagerModules
         )
       );
     in
     map (name: self.homeManagerModules.${name}) names;
 
+  # Thin HM slice: an `enable` toggle that adds packages to `home.packages`, skipping
+  # any not `availableOn` this platform. `packages` is a `pkgs -> [ drv ]` function so
+  # callers only name each package once (the helper owns the platform-gating). Used by
+  # the trivial single-package wisdom slices so they stay one declarative block instead
+  # of the repeated `root/cfg` + `mkIf (root.enable && cfg.enable)` boilerplate.
+  flake.lib.wisdomSimpleSlice =
+    { path, default, description, packages }:
+    { config, lib, pkgs, ... }:
+    let
+      segs = lib.splitString "." path;
+      optPath = [ "chiasson" "home" ] ++ segs ++ [ "enable" ];
+      enabled = lib.getAttrFromPath optPath config;
+    in
+    {
+      options = lib.setAttrByPath optPath (lib.mkEnableOption description // { inherit default; });
+      config = lib.mkIf (config.chiasson.home.enable && enabled) {
+        home.packages = lib.filter (lib.meta.availableOn pkgs.stdenv.hostPlatform) (packages pkgs);
+      };
+    };
+
   flake.nixosModules.desktopOptions =
     { config, options, lib, pkgs, self, inputs, ... }:
     let

modules/wisdom/browsers/chrome.nix

@@ -1,21 +1,8 @@
-{ ... }: {
-  flake.homeManagerModules.wisdomBrowsersChrome =
-    { config, lib, pkgs, ... }:
-    let
-      root = config.chiasson.home;
-      cfg = config.chiasson.home.browsers.chrome;
-    in
-    {
-      options.chiasson.home.browsers.chrome.enable = lib.mkEnableOption ''
-        Chrome (unfree, needs `allowUnfree`); skipped if nixpkgs has no build for this platform.
-      '' // {
+{ self, ... }: {
+  flake.homeManagerModules.wisdomBrowsersChrome = self.lib.wisdomSimpleSlice {
+    path = "browsers.chrome";
     default = false;
-      };
-
-      config = lib.mkIf (root.enable && cfg.enable) {
-        home.packages = lib.optional (
-          lib.meta.availableOn pkgs.stdenv.hostPlatform pkgs.google-chrome
-        ) pkgs.google-chrome;
-      };
+    description = "Chrome (unfree, needs `allowUnfree`); skipped if nixpkgs has no build for this platform.";
+    packages = pkgs: [ pkgs.google-chrome ];
   };
 }

modules/wisdom/browsers/edge.nix

@@ -1,19 +1,8 @@
-{ ... }: {
-  flake.homeManagerModules.wisdomBrowsersEdge =
-    { config, lib, pkgs, ... }:
-    let
-      root = config.chiasson.home;
-      cfg = config.chiasson.home.browsers.edge;
-    in
-    {
-      options.chiasson.home.browsers.edge.enable = lib.mkEnableOption "Edge (unfree); skipped if unavailable on this platform." // {
+{ self, ... }: {
+  flake.homeManagerModules.wisdomBrowsersEdge = self.lib.wisdomSimpleSlice {
+    path = "browsers.edge";
     default = false;
-      };
-
-      config = lib.mkIf (root.enable && cfg.enable) {
-        home.packages = lib.optional (
-          lib.meta.availableOn pkgs.stdenv.hostPlatform pkgs.microsoft-edge
-        ) pkgs.microsoft-edge;
-      };
+    description = "Edge (unfree); skipped if unavailable on this platform.";
+    packages = pkgs: [ pkgs.microsoft-edge ];
   };
 }

modules/wisdom/default.nix

@@ -1,22 +1,21 @@
 # HM side of the flake; option tree is `chiasson.home.*` (docs/conventions.md).
 { self, inputs, ... }: {
-  # Root module: chiasson.home.enable + bash. Other `wisdom*` slices auto-wire via
-  # `lib.wisdomCatalogExtraModules`; hosts flip `chiasson.home.*.enable` rather than re-importing.
+  # Root module: chiasson.home.enable + git identity. Other `wisdom*` slices (including
+  # the bash shell) auto-wire via `lib.wisdomCatalogExtraModules`; hosts flip
+  # `chiasson.home.*.enable` rather than re-importing.
   flake.homeManagerModules.wisdom =
     { config, lib, pkgs, ... }:
     let
       cfg = config.chiasson.home;
     in
     {
-      imports = [
-        self.homeManagerModules.wisdomShellBash
-      ];
-
       options.chiasson.home = {
-        enable = lib.mkEnableOption ''
+        enable =
+          lib.mkEnableOption ''
             HM profile root for this flake (bash on by default). Desktop hosts use
             `lib.wisdomCatalogExtraModules` once per user and flip `chiasson.home.*.enable` on the host.
-        '' // {
+          ''
+          // {
             default = true;
           };
 
@@ -29,7 +28,8 @@
         };
       };
 
-      config = lib.mkIf cfg.enable (lib.mkMerge [
+      config = lib.mkIf cfg.enable (
+        lib.mkMerge [
           { home.packages = cfg.extraPackages; }
 
           # Base git identity + encryption/player tools shared by every HM user.
@@ -41,8 +41,12 @@
                 email = "olivierchiasson@hotmail.fr";
               };
             };
-          home.packages = [ pkgs.git-crypt pkgs.feishin ];
+            home.packages = [
+              pkgs.git-crypt
+              pkgs.feishin
+            ];
           }
-      ]);
+        ]
+      );
     };
 }

modules/wisdom/editors/kate.nix

@@ -1,19 +1,8 @@
-{ ... }: {
-  flake.homeManagerModules.wisdomEditorsKate =
-    { config, lib, pkgs, ... }:
-    let
-      root = config.chiasson.home;
-      cfg = config.chiasson.home.editors.kate;
-    in
-    {
-      options.chiasson.home.editors.kate.enable = lib.mkEnableOption "Kate." // {
+{ self, ... }: {
+  flake.homeManagerModules.wisdomEditorsKate = self.lib.wisdomSimpleSlice {
+    path = "editors.kate";
     default = false;
-      };
-
-      config = lib.mkIf (root.enable && cfg.enable) {
-        home.packages = lib.optional (
-          lib.meta.availableOn pkgs.stdenv.hostPlatform pkgs.kdePackages.kate
-        ) pkgs.kdePackages.kate;
-      };
+    description = "Kate.";
+    packages = pkgs: [ pkgs.kdePackages.kate ];
   };
 }

modules/wisdom/editors/obsidian.nix

@@ -1,21 +1,8 @@
-{ ... }: {
-  flake.homeManagerModules.wisdomEditorsObsidian =
-    { config, lib, pkgs, ... }:
-    let
-      root = config.chiasson.home;
-      cfg = config.chiasson.home.editors.obsidian;
-    in
-    {
-      options.chiasson.home.editors.obsidian.enable = lib.mkEnableOption ''
-        Obsidian (unfree); skipped if unavailable here.
-      '' // {
+{ self, ... }: {
+  flake.homeManagerModules.wisdomEditorsObsidian = self.lib.wisdomSimpleSlice {
+    path = "editors.obsidian";
     default = true;
-      };
-
-      config = lib.mkIf (root.enable && cfg.enable) {
-        home.packages = lib.optional (
-          lib.meta.availableOn pkgs.stdenv.hostPlatform pkgs.obsidian
-        ) pkgs.obsidian;
-      };
+    description = "Obsidian (unfree); skipped if unavailable here.";
+    packages = pkgs: [ pkgs.obsidian ];
   };
 }