Inconsistent worktree cleanup for Option 2 in finishing-a-development-branch

[zdvizhkov]

Bug Description

There is an inconsistency in skills/finishing-a-development-branch/SKILL.md for Option 2.

Currently the file says both:

• Option 2: Then: Cleanup worktree (Step 5)
• Step 5: For Options 1, 2, 4:

But later the same file says the opposite:

• Quick Reference shows Keep Worktree ✓ for Option 2
• Common Mistakes says cleanup should be only for Options 1 and 4
• Always says cleanup should be only for Options 1 and 4

This makes Option 2 ambiguous.

Suggested fix

• remove Then: Cleanup worktree (Step 5) from Option 2
• change Step 5 from For Options 1, 2, 4: to For Options 1, 4:

That would make the file internally consistent and match the documented intent that Option 2 keeps the worktree.