feat(a2a): Introduce restore command for a2a server (#13015)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Shreya Keshive <shreyakeshive@google.com>

packages/core/src/services/gitService.ts

@@ -112,6 +112,11 @@ export class GitService {
     try {
       const repo = this.shadowGitRepository;
       await repo.add('.');
+      const status = await repo.status();
+      if (status.isClean()) {
+        // If no changes are staged, return the current HEAD commit hash
+        return await this.getCurrentCommitHash();
+      }
       const commitResult = await repo.commit(message, {
         '--no-verify': null,
       });