修复 Native shell 作业在测试阶段才解析 crates.io index 的缺口

- .gitea/workflows/project-ci.yml：Native shell tests 新增「Prepare standalone Rust crate dependencies」步骤，
  对被 server-rs workspace exclude 的 agent-runtime-core / agent-runtime-orchestration 先做 cargo fetch，
  把它们在测试阶段的 registry 解析与下载提前到依赖准备阶段；两 crate 未提交 Cargo.lock，故不能带 --locked
- scripts/project-ci-workflow.test.ts：新增用例钉住该步骤存在、覆盖两个独立 crate manifest、且命令不带锁标志

根因与影响见 #327：此前这两个 crate 只在 agent-runtime-*:check 中现场 `Updating crates.io index`，
crates.io 一抖动整条 native shell 作业就红（PR #316 run 1950）。

scripts/project-ci-workflow.test.ts

@@ -321,4 +321,26 @@ describe('project CI workflow', () => {
     expect(nativeJob).toContain('server-rs/Cargo.toml');
     expect(nativeJob).toContain('cargo fetch --locked');
   });
+
+  it('prefetches the excluded standalone Rust crates before the native shell gates', () => {
+    const standaloneStep = stepSection(
+      'native-shell-tests',
+      'Prepare standalone Rust crate dependencies',
+    );
+    for (const manifest of [
+      'server-rs/crates/agent-runtime-core/Cargo.toml',
+      'server-rs/crates/agent-runtime-orchestration/Cargo.toml',
+    ]) {
+      expect(standaloneStep).toContain(manifest);
+    }
+    // 这两个 crate 没有提交 Cargo.lock，只能用不带 --locked 的 fetch：
+    // 带 --locked 会因为缺少锁文件直接失败。
+    expect(standaloneStep).toContain('cargo fetch \\');
+    expect(standaloneStep).not.toContain('cargo fetch --locked');
+
+    const nativeJob = jobSection('native-shell-tests');
+    expect(
+      nativeJob.indexOf('Prepare standalone Rust crate dependencies'),
+    ).toBeLessThan(nativeJob.indexOf('run: npm run check:native-shells'));
+  });
 });