Skill follow-up: static-analysis-security

## Summary
Address the follow-up actions for the static-analysis-security skill as identified in the skills review.

## Acceptance Criteria
- [ ] Add sample suppression entries and evidence capture guidance.

## Scope
- Applies to `skills/static-analysis-security/`
- Derived from skills-review.md (commit 9c59dbc)

## Parent
- Refs: #297
