[AZ-243] Record security audit

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/05_security/dependency_scan.md

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+# Dependency Vulnerability Scan
+
+**Date**: 2026-05-07
+**Tool**: `pip-audit 2.10.0`
+**Manifest**: `pyproject.toml`
+**Result**: PASS
+
+## Scope
+
+The scan covered the Python dependencies declared in `pyproject.toml`, including the `dev` optional dependency group:
+
+- `pydantic==2.13.3`
+- `black>=24.0`
+- `pytest>=8.0`
+- `ruff>=0.5`
+
+## Findings
+
+No known vulnerabilities were reported.
+
+## Audit Output Summary
+
+`pip-audit` resolved and checked the project dependency set and returned:
+
+```text
+No known vulnerabilities found
+```
+
+Resolved packages with no advisories included `pydantic`, `pydantic-core`, `black`, `pytest`, and `ruff`.
+
+## Notes
+
+- `pip-audit` and its own transitive packages were installed as an audit tool in the local Python environment.
+- The repository does not currently include a locked production dependency file, so the audit used the version constraints from `pyproject.toml`.