feat: add sidecar and td packages, fix neovim extraLuaConfig

pkgs/sidecar/default.nix

@@ -0,0 +1,66 @@
+{
+  lib,
+  buildGoModule,
+  fetchFromGitHub,
+  gitMinimal,
+  makeWrapper, # Add this
+  nix-update-script,
+  td, # Add this - the td package
+  versionCheckHook,
+  writableTmpDirAsHomeHook,
+}:
+buildGoModule (finalAttrs: {
+  pname = "sidecar";
+  version = "0.71.0";
+
+  src = fetchFromGitHub {
+    owner = "marcus";
+    repo = "sidecar";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-/tCdhU5Q6ejSSFZCeep6BFWpvAgjyC2KPcDaX0ls8eI=";
+  };
+
+  vendorHash = "sha256-R/AjNJ4x4t1zXXzT+21cjY+9pxs4DVXU4xs88BQvHx4=";
+
+  subPackages = ["cmd/sidecar"];
+
+  ldflags = [
+    "-s"
+    "-w"
+    "-X main.Version=v${finalAttrs.version}" # Can combine these
+  ];
+
+  nativeBuildInputs = [makeWrapper]; # Add this
+
+  nativeCheckInputs = [
+    gitMinimal
+    writableTmpDirAsHomeHook
+  ];
+
+  nativeInstallCheckInputs = [
+    versionCheckHook
+    writableTmpDirAsHomeHook
+  ];
+
+  versionCheckProgramArg = "--version";
+  doInstallCheck = true;
+  doCheck = false;
+
+  postInstall = ''
+    wrapProgram $out/bin/sidecar \
+      --prefix PATH : ${lib.makeBinPath [td]}
+  '';
+
+  passthru = {
+    updateScript = nix-update-script {};
+  };
+
+  meta = {
+    description = "Use sidecar next to CLI agents for diffs, file trees, conversation history, and task management with td";
+    homepage = "https://github.com/marcus/sidecar";
+    changelog = "https://github.com/marcus/sidecar/releases/tag/v${finalAttrs.version}";
+    license = lib.licenses.mit;
+    mainProgram = "sidecar";
+    platforms = lib.platforms.unix;
+  };
+})