release: v0.2.4 里程碑快照（孤儿提交，无父；树 = dev 68362e5）

本批内容见 CHANGELOG.md 的 0.2.4 段。按 D41 用孤儿快照推 main，保留「公开史只有里程碑」的模型。

crates/core/tests/platform/prelude.rs

@@ -0,0 +1,53 @@
+//! 测试共用设施（crate 名只出现在这里）。
+
+use std::path::PathBuf;
+
+pub use unlucky_core::launch::args_table::assemble;
+pub use unlucky_core::launch::argument::{ArgumentEntry, OsRule, Rule, RuleContext};
+pub use unlucky_core::launch::game_version::GameVersion;
+pub use unlucky_core::launch::platform::{OsFamily, PlatformCtx};
+pub use unlucky_core::launch::request::*;
+pub use unlucky_core::platform::linux_caps::{self, GlProbe, LinuxCaps, SessionKind};
+pub use unlucky_core::platform::macos_version::{self, MacOsVersion};
+pub use unlucky_core::platform::os_info::{self, OsInfo, SupportCheck, SupportLevel};
+pub use unlucky_core::platform::vk_probe::{
+    classify, count_icd_manifests, env_icd_path, ldconfig_has_libvulkan, loader_candidates,
+    probe_vk, registry_has_driver_entry, VkEvidence, VkProbe, ICD_DIRS, ICD_ENV_VARS,
+    VULKAN_DRIVERS_KEY,
+};
+pub use unlucky_core::platform::windows_version::{self, WindowsVersion};
+
+/// 一个最小可组装请求：现代清单，游戏参数由调用方给。
+pub fn request_with_game(game: Vec<ArgumentEntry>) -> LaunchRequest {
+    LaunchRequest {
+        instance: InstanceInfo {
+            id: "inst-1".to_string(),
+            name: "1.20.1".to_string(),
+            version: GameVersion::parse("1.20.1"),
+            version_type: "release".to_string(),
+        },
+        launcher: LauncherInfo {
+            name: "UnluckyLauncher".to_string(),
+            version: "0.1.0".to_string(),
+        },
+        java: JavaSelection::new("C:/java/bin/java.exe", 17, 64),
+        manifest: ManifestArgs {
+            main_class: Some("net.minecraft.client.main.Main".to_string()),
+            game,
+            ..ManifestArgs::default()
+        },
+        classpath: vec![PathBuf::from("C:/mc/libraries/a.jar")],
+        ..LaunchRequest::default()
+    }
+}
+
+/// 一条带 `rules.os.version` 的游戏参数项。
+pub fn version_ruled_entry(pattern: &str, value: &str) -> ArgumentEntry {
+    let mut rule = Rule::allow();
+    rule.os = Some(OsRule {
+        name: None,
+        arch: None,
+        version: Some(pattern.to_string()),
+    });
+    ArgumentEntry::ruled(vec![rule], [value])
+}