feat: initial v3 rewrite

flake.nix

@@ -0,0 +1,37 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    ren.url = "gitlab:rensa-nix/core?dir=lib";
+  };
+
+  outputs = {
+    self,
+    ren,
+    ...
+  } @ inputs:
+    ren.buildWith
+    {
+      inherit inputs;
+      cellsFrom = ./nix;
+      transformInputs = system: i:
+        i
+        // {
+          pkgs = import i.nixpkgs {inherit system;};
+        };
+      cellBlocks = with ren.blocks; [
+        (simple "devShells")
+        (simple "pkgs")
+        # (simple "tests")
+        # (simple "docs")
+        (simple "ci")
+      ];
+    }
+    {
+      packages = ren.select self [
+        # ["repo" "tests"]
+        # ["repo" "docs"]
+        ["repo" "ci" "packages"]
+        ["packages" "pkgs"]
+      ];
+    };
+}