ci: add Semgrep CE and Trivy scanning

[LucasSantana-Dev]

Summary

• Add Semgrep CE for SAST scanning (free, no token needed)
• Add Trivy for filesystem vulnerability scanning (HIGH/CRITICAL)

Test plan

• Semgrep workflow runs on PR
• Trivy workflow runs on PR

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b6e9ecd8-5ee6-4a88-b2b3-8b1b29413bdc

📥 Commits

Reviewing files that changed from the base of the PR and between ca77a44 and ada3f5e.

📒 Files selected for processing (2)

• .github/workflows/semgrep.yml
• .github/workflows/trivy.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ci/security-scanning

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