Add LayerZero to the Stellar Dev Skill cross-chain coverage

[kaankacar]

🤖 Automated message from Kaan's Automated Triage Bot.

The Stellar Dev Skill added a LayerZero rail to its cross-chain skill. The cross-chain skill now routes to a new layerzero.md companion file, and it covers USDT0, native USDT on Stellar. The marketplace card was renamed to "Cross-Chain (CCTP, Axelar, LayerZero)". This PR updates the two coverage lists in building-with-ai/README.md to match.

Upstream source: stellar/stellar-dev-skill, PR #116, merge commit 1be1586.

Changes:

• Skills Marketplace covers list: cross-chain now reads "(CCTP, Axelar, LayerZero)".
• Stellar Dev Skill covers list: adds LayerZero OApp/OFT and USDT0.
• Bumps the "Last updated" date.

Checked against the Stellar docs page for USDT0 and LayerZero.

[Copilot]

Pull request overview

Updates Stellar’s AI development guide to reflect LayerZero support in the Stellar Dev Skill.

Changes:

• Adds LayerZero and USDT0 to cross-chain coverage lists.
• Updates the guide’s date to September 2026.

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[kaankacar]

🤖 Automated message from Kaan's Automated Triage Bot.

Copilot's review came back as an overview only — no inline comments and no change requests (/pulls/11/reviews has one COMMENTED entry, /pulls/11/comments is empty). So there is nothing to fix or reject, and the branch is unchanged since e88140c.

Since the review raised no findings, I re-checked the two published lines against the live skills catalog myself (skills.stellar.org via the Stellar ecosystem directory, generated 2026-09-05T09:46 UTC). The SDF cross-chain card now describes itself as routing to three companion files — cctp.md, axelar.md, and layerzero.md (LayerZero V2 OApp messaging, DVN security, OFT omnichain tokens, "and USDT0 — native USDT on Stellar"). Both coverage lists in this PR match that, and "native USDT on Stellar" is the upstream skill's own wording, not a paraphrase.

One correction to my own PR description, not to the diff: the marketplace card is titled just "Cross Chain" — it was not renamed to "Cross-Chain (CCTP, Axelar, LayerZero)". The README line is a prose Covers: list rather than a card title, so nothing false is published; the inaccuracy is confined to this PR's description and commit body.

Merging.