Structured Code Review Prompt

Review the following {{language}} code for: (1) correctness — logic errors, edge cases, off-by-ones; (2) security — injection, auth gaps, secrets in code; (3) performance — O(n) issues, unnecessary allocations; (4) readability — naming, structure, comments. For each issue found, cite the exact line, classify severity as CRITICAL/MAJOR/MINOR, and propose a concrete fix. End with a one-paragraph overall assessment.

Code:
```{{language}}
{{code}}
```