refactor: use *const Integrity for function parameters

Pass Integrity by pointer instead of by value to avoid unnecessary copies.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/install/PackageInstaller.zig

@@ -1003,7 +1003,7 @@ pub const PackageInstaller = struct {
                             alias.slice(this.lockfile.buffers.string_bytes.items),
                             resolution,
                             context,
-                            this.lockfile.packages.items(.meta)[package_id].integrity,
+                            &this.lockfile.packages.items(.meta)[package_id].integrity,
                         );
                     },
                     .remote_tarball => {

src/install/PackageManager/PackageManagerEnqueue.zig

@@ -129,7 +129,7 @@ pub fn enqueueTarballForReading(
     alias: string,
     resolution: *const Resolution,
     task_context: TaskCallbackContext,
-    integrity: Integrity,
+    integrity: *const Integrity,
 ) void {
     const path = this.lockfile.str(&resolution.value.local_tarball);
     const task_id = Task.Id.forTarball(path);
@@ -152,7 +152,7 @@ pub fn enqueueTarballForReading(
         alias,
         path,
         resolution.*,
-        integrity,
+        integrity.*,
     )));
 }
 

src/install/isolated_install.zig

@@ -1085,7 +1085,7 @@ pub fn installIsolatedPackages(
                                 dep.name.slice(string_buf),
                                 &pkg_res,
                                 ctx,
-                                lockfile.packages.items(.meta)[pkg_id].integrity,
+                                &lockfile.packages.items(.meta)[pkg_id].integrity,
                             );
                         },
                         .remote_tarball => {