feat(open-code-review): expose ocr alias for the CLI binary

Upstream and the bundled OpenCode plugin invoke the tool as `ocr`, but the
Go build names the binary after its cmd/ directory (`opencodereview`), so
the CLI was missing from PATH under the name everything expects.

packages/open-code-review/package.nix

@@ -24,6 +24,12 @@ buildGoModule rec {
 
   doCheck = false;
 
+  # Upstream (and the bundled OpenCode plugin) invokes the CLI as `ocr`, but the
+  # Go build names the binary after its cmd/ directory.
+  postInstall = ''
+    ln -s $out/bin/opencodereview $out/bin/ocr
+  '';
+
   ldflags = [
     "-s"
     "-w"