fix(worker): pass logger to getAuthCredentialsForRepo during repo sync (#1300)

* fix(worker): pass logger to getAuthCredentialsForRepo during repo sync

Without a logger, the debug lines in getAuthCredentialsForRepo (e.g.
"Using GitHub App for service auth...") were no-ops during indexing,
hiding which auth branch was taken when diagnosing sync failures.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs: add CHANGELOG entry for #1300

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs: remove CHANGELOG entry for #1300

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: brendan-kellam

packages/backend/src/repoIndexManager.ts

@@ -351,7 +351,7 @@ export class RepoIndexManager {
 
         const metadata = repoMetadataSchema.parse(repo.metadata);
 
-        const credentials = await getAuthCredentialsForRepo(repo);
+        const credentials = await getAuthCredentialsForRepo(repo, logger);
         const cloneUrlMaybeWithToken = credentials?.cloneUrlWithToken ?? repo.cloneUrl;
         const authHeader = credentials?.authHeader ?? undefined;