fix(issue-detection): Stop reverting cron schedule change from master

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: roggenkemper

src/sentry/conf/server.py

@@ -1216,7 +1216,7 @@ def SOCIAL_AUTH_DEFAULT_USERNAME() -> str:
     },
     "llm-issue-detection": {
         "task": "issues:sentry.tasks.llm_issue_detection.run_llm_issue_detection",
-        "schedule": crontab("0", "*", "*", "*", "*"),
+        "schedule": crontab("*/15", "*", "*", "*", "*"),
     },
     "preprod-detect-expired-artifacts": {
         "task": "preprod:sentry.preprod.tasks.detect_expired_preprod_artifacts",