feat(lab3): SSH signing + gitleaks pre-commit + history rewrite practice

[IamdLite]

Pull Request

Goal

SSH commit and signing for non-repudiation mechanisms, and secret exposure prevention via pre-commits with gitleaks

Changes

• .pre-commit-config.yaml added
• submissions/lab3 added

Testing

• Commands run and observed output are indicated in submissions/lab3.md

Artifacts & Screenshots

• Links to submission (latest commit): cc0de71

• Images:

PR checklist :

• Task 1 — SSH signing configured + Verified badge on commit
• Task 2 — .pre-commit-config.yaml + gitleaks demonstrably blocking
• Bonus — filter-repo rewrite practice documented
  --
• Title uses feat(labN): <topic> style
• No secrets/large temp files committed
• submissions/labN.md present