fix(backend): serialize error objects with JSON.stringify in bitbucket error messages

Replace error.type interpolation with JSON.stringify(error) for consistent
and complete error serialization. Also remove stray space before parenthesis
in one throw expression.

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

Author: brendan-kellam

packages/backend/src/bitbucket.ts

@@ -275,7 +275,7 @@ async function cloudGetReposForProjects(client: BitbucketClient, projects: strin
                     });
                     const { data, error } = response;
                     if (error) {
-                        throw new Error (`Failed to fetch projects for workspace ${workspace}: ${error.type}`);
+                        throw new Error(`Failed to fetch projects for workspace ${workspace}: ${JSON.stringify(error)}`);
                     }
                     return data;
                 });
@@ -331,7 +331,7 @@ async function cloudGetRepos(client: BitbucketClient, repoList: string[]): Promi
                 const response = await client.apiClient.GET(path);
                 const { data, error } = response;
                 if (error) {
-                    throw new Error(`Failed to fetch repo ${repo}: ${error.type}`);
+                    throw new Error(`Failed to fetch repo ${repo}: ${JSON.stringify(error)}`);
                 }
                 return data;
             }, `repo ${repo}`, logger);
@@ -542,7 +542,7 @@ async function serverGetRepos(client: BitbucketClient, repoList: string[]): Prom
                 const response = await client.apiClient.GET(path);
                 const { data, error } = response;
                 if (error) {
-                    throw new Error(`Failed to fetch repo ${repo}: ${error.type}`);
+                    throw new Error(`Failed to fetch repo ${repo}: ${JSON.stringify(error)}`);
                 }
                 return data;
             }, `repo ${repo}`, logger);