L2: Implement NTT for polynomial multiplication

[JirA44]

Fixes #1

Closes #1

[abhicris]

Welcome to kcolbchain, @JirA44 — glad you're here. 🌱

Here's what happens from this PR:

1. Our automated review looks for obvious issues (tests, secrets, size) within a couple of hours.
2. If it's clean and CI passes, we merge without back-and-forth.
3. If we need changes, we'll leave a specific comment — not a generic nit. Push another commit and we re-review.

While you wait:

• Run the repo's tests locally (see the repo README.md).
• Keep the PR scoped to one concern — bigger PRs land slower.
• Don't commit tokens or .env contents.

What happens after your first merge

• You're listed on https://kcolbchain.com/contributors/ (opt-out anytime via data/contributors-optout.txt).
• At 2+ merged PRs you're a Regular; at 5+ you're a Fellow — Fellows are the pool we invite first for paid research, partner-org gigs, and grant-funded work. Details: https://kcolbchain.com/docs/org-contribution-policy.html
• Looking for what to pick up next? https://kcolbchain.com/invitations/ lists open help-wanted / good-first-issue across every kcolbchain repo.

Thanks for writing the code. We're building this to last.

[abhicris]

Merged — thank you, @JirA44. Your first kcolbchain contribution is in. 🎉

A few things that unlocked with this merge:

• You'll appear on https://kcolbchain.com/contributors/ on the next daily rebuild. Opt out anytime via data/contributors-optout.txt on the website repo.
• You're now a Newcomer in the ladder. At 2 merged PRs you're a Regular; at 5+ you're a Fellow — that's the pool we invite first for paid research, partner-org engagements, and grant milestones. Full policy: https://kcolbchain.com/docs/org-contribution-policy.html
• Looking for the next thing to pick up? https://kcolbchain.com/invitations/ is the live list of open help-wanted / good-first-issue across every kcolbchain repo, refreshed daily.

If you want to stay in the loop on what we're shipping: https://kcolbchain.com/ROADMAP.md

[JirA44]

Payment address (Base): 0x377706801308ac4c3Fe86EEBB295FeC6E1279140