Expand risky-code audit recipes for common dogfooding findings

[Widthdom]

Found while dogfooding the current source with cdidx search --recipe risky-code.

The current recipe set is useful but small. During dogfooding, repeated manual searches were needed for patterns like:

• empty catch blocks
• broad catch (Exception)
• ProcessStartInfo / external process launch
• recursive delete
• raw ex.Message
• Timeout.InfiniteTimeSpan
• path case-sensitivity heuristics
• direct regex construction / timeout checks

Expected: expand SearchAuditRecipes with these common audit searches, labels, and false-positive guidance.

[Widthdom]

Work started on branch fix-issue3385-3387-3390-3440-3448.