refactor custom emacs packages

flakes/emacs/pkgs/agent-shell.nix

@@ -0,0 +1,23 @@
+{ pkgs, final }:
+final.melpaBuild {
+  pname = "agent-shell";
+  ename = "agent-shell";
+  version = "0.47.3";
+
+  src = pkgs.fetchFromGitHub {
+    owner = "xenodium";
+    repo = "agent-shell";
+    rev = "v0.50.1";
+    hash = "sha256-y3WKd7w9zNebNlP3phMLmMbrFd+MHqwwJH/dUP6VSlo=";
+  };
+
+  packageRequires = with final; [
+    acp
+    shell-maker
+  ];
+
+  meta = {
+    homepage = "https://github.com/xenodium/agent-shell";
+    description = "Native agentic integrations for Claude Code, Gemini CLI, etc";
+  };
+}

flakes/emacs/pkgs/default.nix

@@ -0,0 +1,10 @@
+{ pkgs }:
+final: prev: {
+  shell-maker = import ./shell-maker.nix {
+    inherit pkgs prev;
+  };
+
+  agent-shell = import ./agent-shell.nix {
+    inherit pkgs final;
+  };
+}

flakes/emacs/pkgs/shell-maker.nix

@@ -0,0 +1,10 @@
+{ pkgs, prev }:
+prev.shell-maker.overrideAttrs (_: {
+  version = "0.90.1";
+  src = pkgs.fetchFromGitHub {
+    owner = "xenodium";
+    repo = "shell-maker";
+    rev = "55f829d179608a3c4b11e86427713d5be7c4bb58";
+    hash = "sha256-tFzyVXxgrR6LOPUhX4MgJNLy3PX+pwprjdYi+IZXr+E=";
+  };
+})