feat: publish official resources atomically

Fixes #9

Fixes #11

infrastructure/tests/official_game_main_config_bootstrap.rs

@@ -229,6 +229,27 @@ fn official_update_first_run_pulls_without_pre_audit() {
     assert!(events
         .iter()
         .any(|event| { event.stage == "decision" && event.message.contains("首次拉取=true") }));
+
+    let published = report.published_version_path.as_ref().unwrap();
+    assert!(published.exists());
+    assert!(report
+        .staging_path
+        .as_ref()
+        .is_some_and(|path| !path.exists()));
+    assert!(config.output_root.join("current").exists());
+    assert!(fs::symlink_metadata(config.output_root.join("current"))
+        .unwrap()
+        .file_type()
+        .is_symlink());
+    assert_eq!(
+        config
+            .output_root
+            .join("official-download-manifest.json")
+            .exists(),
+        false
+    );
+    assert!(published.join("official-download-manifest.json").exists());
+    assert!(published.join("official-sync-snapshot.json").exists());
 }
 
 #[test]
@@ -262,6 +283,11 @@ fn official_update_second_run_audits_existing_resources_before_reuse() {
     assert!(events.iter().any(|event| {
         event.stage == "decision" && event.message.contains("首次拉取=false")
     }));
+    assert!(config.output_root.join("current").exists());
+    assert!(fs::symlink_metadata(config.output_root.join("current"))
+        .unwrap()
+        .file_type()
+        .is_symlink());
 }
 
 struct TestHarness {