feat: initial m3ta-home structure

- flake.nix with nixpkgs, home-manager, nix-colors, m3ta-nixpkgs, agenix, NUR inputs
- lib/mkHome.nix: compose HM config from user + identity + context + sets
- profiles/base: shell, cli-tools, secrets (always loaded)
- profiles/contexts/desktop: WM, apps, theme, ghostty
- profiles/contexts/server: minimal headless
- profiles/sets/coding: core (git, direnv, jq, rg), editor, lsp, languages, agents
- profiles/sets/gaming: steam, gamescope, gpu
- profiles/sets/media: obs, ffmpeg, kdenlive, handbrake, yt-dlp
- users/m3tam3re/identities: private.nix, work.nix (git, jj, ssh per identity)
- users/m3tam3re/preferences: cliphist, difftastic, base packages

README.md

@@ -0,0 +1,38 @@
+# m3ta-home — Portable User Profiles
+
+Centralized home-manager configurations for NixOS systems.
+Separates user identity, preferences, and feature sets for portable deployment.
+
+## Structure
+
+```
+m3ta-home/
+├── lib/           ← mkHome, mkDevShell
+├── modules/       ← Home-Manager module exports
+├── profiles/      ← base, contexts, sets
+├── users/         ← identity, preferences, secrets
+└── secrets/       ← Agenix-encrypted user secrets
+```
+
+## Usage in nixos-config
+
+```nix
+inputs.m3ta-home = {
+  url = "git+ssh://gitea@code.m3ta.dev/m3tam3re/m3ta-home.git";
+  inputs.nixpkgs.follows = "nixpkgs";
+};
+```
+
+```nix
+# hosts/common/users/m3tam3re.nix
+home-manager.users.m3tam3re = {
+  imports = [
+    (inputs.m3ta-home.lib.mkHome {
+      user = "m3tam3re";
+      identity = "private";
+      context = "desktop";
+      sets = [ "coding" "gaming" "media" ];
+    })
+  ];
+};
+```