◇ Could this help me?
Yes. Explicitly requesting security audits from the coding agent is a genuinely effective, zero-install practice (agents do not apply security rigor unprompted, and audits reliably catch injection risks and leaked secrets), and the discipline of fixing every finding is the part most people skip. It complements row 67's three manual checks: run the agent audit for coverage, keep the manual checks for verification, and the two together form a solid pre-ship routine. General practice for every shipped project, not project-specific.
Run a comprehensive pre-ship security audit of this codebase. First, generate the strongest audit checklist you can for this stack, covering at minimum: injection risks (SQL and otherwise), secrets or access keys in the code or committed anywhere in git history, authentication and authorization gaps on every page and endpoint, unvalidated input, and insecure defaults. Then execute the audit, fanning out subagents if useful for coverage, and report every finding ranked by severity with a concrete fix. After the fixes are approved, implement and verify them one by one, and do not consider the audit complete until every flagged item is fixed and the fixes are deployed.