init: empty repo for unified nixos flake

.gitignore

@@ -0,0 +1,2 @@
+/result
+/result-*

README.md

@@ -0,0 +1,12 @@
+# nixos
+
+Unified NixOS flake for three hosts:
+
+- **mreow** — Framework 13 AMD AI 300 laptop (nixos-unstable)
+- **yarn** — AMD Zen 5 desktop with Jovian-NixOS Steam mode (nixos-unstable, pull-based updates)
+- **muffin** — AMD Zen 3 server (nixos-25.11, deploy-rs, agenix, ZFS, Caddy + services)
+
+This repository was created by merging the histories of `dotfiles` (mreow, yarn) and `server-config` (muffin)
+via `git subtree add`. See `git log --follow <file>` to trace any file across the merge.
+
+See `AGENTS.md` for development conventions.