Lab 2 submission

[ovsvp]

Goal

Complete Lab 2: Version Control Deep Dive.

Changes

• Inspected the Git object model from HEAD to tree to blob.
• Inspected the internal .git directory.
• Practiced reflog recovery after a hard reset.
• Created and verified a signed annotated tag.
• Rebased feature/lab2 onto the updated origin/main.
• Used --force-with-lease after the rebase.
• Completed the bonus Git bisect task and identified the first bad commit.
• Added all required evidence and explanations to submissions/lab2.md.

Testing

• Verified Git signatures.
• Verified the signed tag.
• Verified the working tree is clean.
• Verified the PR diff contains only submissions/lab2.md.
• Ran the automated bisect test using go test ./... and go build ./....

Checklist

• submissions/lab2.md updated
• Required Lab 2 tasks completed
• Bonus bisect task completed
• Commits signed and signed off