Claim contributor slot 3 in contributors.md

[mergeworthy]

The contributors wall has six numbered slots reserved as guaranteed first-PR opportunities. Slot 3 is open.

What to do

Replace this line in contributors.md:

3. *Slot 3 — open. Claim via the corresponding issue.*

with:

3. [Your Name](https://github.com/your-username) — first contribution: [PR title](pr-url-once-you-open-it)

Acceptance criteria

• Slot 3's placeholder line is replaced with your real entry.
• The format matches the existing entry on slot 1: - [Name](github-profile-url) — first contribution: [PR title](pr-url).
• No other slots are modified.
• The PR includes Closes # referencing this issue.

The PR can reference itself in the "first contribution" link.

Estimated time

~10 minutes.

Want to work on this?

Comment below to claim it before working on it. Once you claim, it's yours. New to opening a PR? See CONTRIBUTING.md.