March 2026 highlights security and correctness improvements across Copilot and VS Code. Delivered the Secrets Scanner Hook for github/awesome-copilot, which runs at sessionEnd to scan files touched during a coding session across diff, staged, or all scopes, for leaked secrets and sensitive data (configurable via SCAN_MODE, SCAN_SCOPE, SECRETS_ALLOWLIST). This reduces credential exposure risk and strengthens secure coding practices. In microsoft/vscode, fixed critical correctness and measurement issues: robust ID sanitization by ensuring all '.' and '/' are replaced in IDs and added a regression test; corrected operator precedence in fuzzy scoring test assertions; and fixed startup metrics accuracy in the performance view by addressing a copy-paste bug in blocking startup counts. These changes improve reliability, security posture, and reporting fidelity, delivering business value in security, quality, and user experience.