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

[semyonnadutkin]

Goal

Add SSH signing key, introduce pre-commit config, use filter-repo.

Changes

• Added submissions/lab3.md, .pre-commit-config.yaml

Testing

pre-commit was used to test for the leaked secrets.

Commands executed:

pre-commit run --all-files

Observed output:

Detect hardcoded secrets.................................................Passed
detect private key.......................................................Passed
check for added large files..............................................Passed

Artifacts & Screenshots

Artifacts

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

Screenshots

Figure 1: Verified badge on commit

Checklist

• Title is clear (feat(labN): <topic> style)
• No secrets/large temp files committed
• Submission file at submissions/labN.md exists

• Task 1 — SSH signing configured + Verified badge on commit
• Task 2 — .pre-commit-config.yaml + gitleaks demonstrably blocking
• Bonus — filter-repo rewrite practice documented