Build workspace agent, capability graph, and versioned cutovers

quixos-package-helpers.nix

@@ -611,6 +611,15 @@ EOF
           else ''
             runHook preInstall
             install -Dm755 ${lib.escapeShellArg serverFile} "$out/libexec/${serverLibexecName}/${serverFile}"
+            # Browser entrypoints are runtime artifacts too. Package build scripts
+            # conventionally emit them as top-level .mjs files in dist/. Install
+            # the complete set so adding an entrypoint cannot produce a descriptor
+            # that resolves successfully but fails when Web Studio opens the file.
+            for browserModule in dist/*.mjs; do
+              if [ -f "$browserModule" ]; then
+                install -Dm644 "$browserModule" "$out/libexec/${serverLibexecName}/$(basename "$browserModule")"
+              fi
+            done
             ${lib.concatMapStringsSep "\n" installExtraFile extraFiles}
             mkdir -p "$out/bin"
             cat > "$out/bin/${serverBin}" <<EOF