feat(agent-skills): install the wiki and consume vault skills

Source the wiki and consume skills from the skills flake, placing them
globally so they are active in every project. wiki reads the personal
Obsidian vault read-only, and consume mines a source into it, pairing
with the Obsidian vault this branch installs.

flake.lock

@@ -494,11 +494,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1784776947,
-        "narHash": "sha256-IGVn6Z7dfeArObZvz7cLsGqJD8ipP2VkAZC/bOJgvJI=",
+        "lastModified": 1784937824,
+        "narHash": "sha256-ncagIdsvmlcJ2DeFHU6R2wBZoOJFDPGVlsmYU8DfImg=",
         "ref": "refs/heads/main",
-        "rev": "1caf18d72dd7cad7304401da0db6a6ba853d8827",
-        "revCount": 5,
+        "rev": "8c17f3aeb8a9c9d95a1427018a93f7d2cf081238",
+        "revCount": 15,
         "type": "git",
         "url": "https://git.alexion.dev/alexion/skills"
       },

hosts/neogaia/default.nix

@@ -55,6 +55,7 @@
   modules.agents.pi.enable = true;
 
   modules.desktop.enable = true;
+  modules.desktop.obsidian.enable = true;
 
   time.timeZone = "America/New_York";
   i18n.defaultLocale = "en_GB.UTF-8";

modules/agents/skills.nix

@@ -1,11 +1,20 @@
-{ config, inputs, ... }:
+{
+  config,
+  inputs,
+  pkgs,
+  ...
+}:
 # Global agent skills, placed under the skills directory so they are active in
 # every project.
 let
   user = config.user.name;
 
   # The skills installed globally, as derivations from the skills flake.
-  skills = [ ];
+  # wiki reads the personal Obsidian vault, and consume mines a source into it.
+  skills = with inputs.skills.packages.${pkgs.stdenv.hostPlatform.system}; [
+    wiki
+    consume
+  ];
 in
 {
   home-manager.sharedModules = [ inputs.skills.homeModules.default ];

modules/desktop/hyprland/hyprland.nix

@@ -63,14 +63,21 @@ in
         "$mod" = "SUPER";
         "$terminal" = "alacritty";
 
-        # Hand the cursor theme to the compositor directly.
-        # UWSM launches the session without the shell profile that carries the
-        # pointer-cursor variables, so without this Hyprland never sees a theme
-        # and falls back to its built-in cursor.
+        # Session variables handed to the compositor directly.
+        # UWSM launches the session without the shell profile that would carry
+        # them, so a variable the compositor or its children must see is set
+        # here rather than through home-manager's sessionVariables.
+        env =
+          [
+            # Chromium and Electron apps read this to select native Wayland;
+            # nixpkgs wrappers (Obsidian's included) gate their Wayland flags on
+            # it, so without it they run under XWayland and blur at this DPI.
+            "NIXOS_OZONE_WL,1"
+          ]
           # Bibata ships XCursor only.
-        # The hyprcursor variables name the same theme, which Hyprland resolves
-        # through its XCursor fallback.
-        env = lib.optionals (cursor != null) [
+          # The hyprcursor variables name the same theme, which Hyprland
+          # resolves through its XCursor fallback.
+          ++ lib.optionals (cursor != null) [
             "XCURSOR_THEME,${cursor.name}"
             "XCURSOR_SIZE,${toString cursor.size}"
             "HYPRCURSOR_THEME,${cursor.name}"

modules/desktop/obsidian.nix

@@ -0,0 +1,18 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+# Obsidian as the desktop note-taking vault.
+let
+  cfg = config.modules.desktop.obsidian;
+  user = config.user.name;
+in
+{
+  options.modules.desktop.obsidian.enable = lib.mkEnableOption "Obsidian as the desktop note-taking vault";
+
+  config = lib.mkIf cfg.enable {
+    home-manager.users.${user}.home.packages = [ pkgs.obsidian ];
+  };
+}

modules/desktop/waybar.nix

@@ -82,6 +82,7 @@ in
             "class<.*[Ff]irefox.*>" = g "f269";
             "class<chromium.*>" = g "f268";
             "class<[Cc]ode>" = g "f121";
+            "class<obsidian>" = g "f02d";
           };
         };