feat(v030): GitClient — fetch/rebaseOnto/rebaseAbort/hasUncommittedChanges/listConflicts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/main/services/GitClient.ts

@@ -89,4 +89,27 @@ export class GitClient {
     if (r.exitCode !== 0) throw new Error(`git rev-parse failed: ${r.stderr}`);
     return r.stdout.trim();
   }
+
+  async fetch(remote: string = 'origin'): Promise<GitExecResult> {
+    return this.run(['fetch', remote]);
+  }
+
+  async rebaseOnto(ref: string): Promise<GitExecResult> {
+    return this.run(['rebase', ref]);
+  }
+
+  async rebaseAbort(): Promise<GitExecResult> {
+    return this.run(['rebase', '--abort']);
+  }
+
+  async hasUncommittedChanges(): Promise<boolean> {
+    const r = await this.run(['status', '--porcelain']);
+    return r.stdout.trim().length > 0;
+  }
+
+  /** rebase conflict 시 conflict 마킹된 파일 list. `git diff --name-only --diff-filter=U`. */
+  async listConflicts(): Promise<string[]> {
+    const r = await this.run(['diff', '--name-only', '--diff-filter=U']);
+    return r.stdout.split('\n').map((s) => s.trim()).filter((s) => s.length > 0);
+  }
 }