error: PHP syntax error from inline heredoc

fix:
Heredoc delimiter must not be indented and must be followed by a semicolon.
Fix: Align the heredoc start/end delimiter (`<<<EOT`) with the left margin and ensure proper syntax.
Example: `echo <<<EOT\nContent\nEOT;`


error: Cerebras rate limit 429

fix:
Root cause: Exceeding Cerebras API rate limits during rapid, consecutive requests.
Impact: 429 errors disrupt testing and block further queries.
Fix: Implement exponential backoff with jitter in retry logic to stay within rate limits.