ci/security/test: automated audit fixes for CryptoStrategies

[Pigbibi]

Summary

• migrate deprecated top-level Ruff ignore settings into tool.ruff.lint.ignore

Problems found

• ruff check . emitted a deprecation warning because ignore was configured at the top-level Ruff section

Fixes applied

• moved ignore from [tool.ruff] to [tool.ruff.lint]

Security impact

• none; lint configuration only

Architecture impact

• none; no runtime or strategy logic changed

Tests run

• .venv/bin/python -m pip check
• .venv/bin/ruff check .
• .venv/bin/python -m pytest -q
• .venv/bin/python -m build
• actionlint
• git diff --check

Failed or skipped checks with reasons

• none

Deployment notes

• no deployment required

Rollback plan

• revert commit addce2d

Manual follow-up checklist

• confirm PR checks pass
• merge after branch protection requirements are satisfied