Feature/lab2

[Ceylary]

Goal

Fully completed lab 2

Changes

• Added submissions/lab2.md with all documented outputs for tasks 1, 2, and bonus
• Explored Git plumbing HEAD → tree → blob → file
• Documented .git/ structure and loose object count
• Simulated disaster recovery via git reflog
• Created signed annotated tag v0.1.0-lab2-Сeylary

Testing

• git tag -v shows "Good" signature
• git log --oneline --graph confirms clean rebase
• git bisect run successfully identified the offending commit
• All commits in this PR are signed and Verified (except 1 that was for test for lab1, it didn't changed anything because failed but remained in history here and now cannot be erased, so just ignore it)

Checklist

• Title is a clear sentence (≤ 70 chars)
• Commits are signed (git log --show-signature)
• submissions/labN.md updated