add: annas-mcp package (Go, fakeHash placeholders)

packages/annas-mcp/package.nix

@@ -2,28 +2,35 @@
   lib,
   buildGoModule,
   fetchFromGitHub,
+  makeWrapper,
 }:
 
 buildGoModule rec {
   pname = "annas-mcp";
-  version = "0.0.5";
+  version = "0.1.0-unstable-2026-06-26";
 
   src = fetchFromGitHub {
     owner = "iosifache";
     repo = "annas-mcp";
-    rev = "v${version}";
+    rev = "c095963ad5d10d33da3c614495246b6ec7f680d4";
-    hash = "sha256-XicM7tU5jD8B8n7JJDQ/84koBiLb8XF4+WBQ4LCUoRU=";
+    hash = lib.fakeHash;
   };
 
-  vendorHash = "sha256-2NdG5p2XfrhVgi388dRDBUSGwg6ybnzfn9495TWNGsA=";
+  vendorHash = lib.fakeHash;
 
-  subPackages = [ "cmd/annas-mcp" ];
+  nativeBuildInputs = [ makeWrapper ];
+
+  # The MCP server mode is invoked with "mcp" subcommand
+  postInstall = ''
+    wrapProgram $out/bin/annas-mcp \
+      --add-flags "mcp"
+  '';
 
   meta = with lib; {
-    description = "MCP server and CLI for searching and downloading documents from Anna's Archive";
+    description = "MCP server and CLI tool for searching and downloading documents from Anna's Archive";
     homepage = "https://github.com/iosifache/annas-mcp";
     license = licenses.mit;
     mainProgram = "annas-mcp";
-    platforms = platforms.all;
+    platforms = platforms.linux;
   };
-}
+}