Method validateRepository

src/lib/github-client.ts:220–230

* Validate that a repository exists and is accessible

(owner: string, repo: string)

   * Validate that a repository exists and is accessible
   */
  async validateRepository(owner: string, repo: string): Promise<boolean> {
    try {
      await this.getRepoInfo(owner, repo);
      return true;
    } catch (error) {
      if (error instanceof GitHubClientError && error.statusCode === 404) {
        return false;
      }
      throw error;
    }
  }

  /**
   * Resolve a ref (branch, tag, or SHA) to a full commit SHA.