feat: improve nix-update workflow and update packages

- Refactor nix-update.yml: push directly to master instead of PRs
- Add skip list for packages without upstream releases
- Add opencode subpackage handling for node_modules
- Add nix-update-script to beads, code2prompt, mem0
- Update mem0: 1.0.0 -> 1.0.2
- Update opencode: 1.1.18 -> 1.1.25
- Fix n8n tag format
- Add n8n update.sh helper script

pkgs/opencode/default.nix

@@ -13,12 +13,12 @@
   writableTmpDirAsHomeHook,
 }: let
   pname = "opencode";
-  version = "1.1.18";
+  version = "1.1.25";
   src = fetchFromGitHub {
     owner = "anomalyco";
     repo = "opencode";
     tag = "v${version}";
-    hash = "sha256-3A4s0FpjZuGB0HGMQVBXfWq+0yHmeIvnEQTSX3amV4I=";
+    hash = "sha256-aF+4LL0x9wU2Ktrv/nJE2VXgUeXFrwJ16pa1sGNhpi4=";
   };
 
   node_modules = stdenvNoCC.mkDerivation {
@@ -66,7 +66,7 @@
     # NOTE: Required else we get errors that our fixed-output derivation references store paths
     dontFixup = true;
 
-    outputHash = "sha256-zSco4ORQQOqV3vMPuP+M/q/hBa+MJGnTKIlxgngMA3g=";
+    outputHash = "sha256-qheQCN71VM3M35+j9XhaCdxQNo5ze8mV8sDFaX0WVWM=";
     outputHashAlgo = "sha256";
     outputHashMode = "recursive";
   };