Qualify hosted development and compose service ownership

restricted-execution/default.nix

@@ -20,17 +20,9 @@ let
     runtime = nativeProbe;
     executable = "${nativeProbe}/bin/probe";
   };
-  identityLauncher =
-    pkgs.runCommand "quixos-restricted-identity-launcher"
-      {
-        nativeBuildInputs = [ pkgs.stdenv.cc ];
-      }
-      ''
-        mkdir -p "$out/bin"
-        $CC -O2 -Wall -Wextra -Werror ${./identity-launcher.c} \
-          -DSANDBOX_EXECUTABLE='"${sandbox}/bin/quixos-restricted-sandbox"' \
-          -o "$out/bin/quixos-restricted-engine"
-      '';
+  mkIdentityLauncher =
+    settings: import ./identity-launcher.nix ({ inherit pkgs sandbox; } // settings);
+  identityLauncher = mkIdentityLauncher { };
   # Transaction-port/value adapters do not need the browser's CRDT/Wasm engine.
   # Keep this surface explicit; it is bundled into checked restricted handlers.
   sdk = pkgs.runCommand "quixos-restricted-sdk" { nativeBuildInputs = [ pkgs.esbuild ]; } ''
@@ -73,6 +65,7 @@ in
     workerd
     sandbox
     identityLauncher
+    mkIdentityLauncher
     nativeProbeSandbox
     sdk
     runtime