Add Calibur (Uniswap) EIP-7702 smart account examples

[Sednaoui]

Summary

• 01-upgrade-eoa.ts: EIP-7702 delegation, batch transactions, AllowAllPaymaster gas sponsorship (EP v0.9 override), shows both private key and signer callback signing options
• 02-passkeys.ts: WebAuthn passkey registration and passkey-signed transactions, auto-delegates EOA if not yet delegated
• 03-manage-keys.ts: Full key lifecycle — list keys, register secondary secp256k1 key, sign with it (signUserOperationWithKey), update expiration, revoke
• webauthn-utils.ts: Node.js WebAuthn authenticator simulator for passkey examples
• README.md: Overview of Calibur, EntryPoint version guidance (v0.8 default vs v0.9 override), key type reference

Dependencies

This PR depends on candidelabs/abstractionkit#72 being merged and a new abstractionkit release published.

Test plan

• Run 01-upgrade-eoa.ts — delegates EOA and batch-mints 2 NFTs with gas sponsorship
• Run 02-passkeys.ts — registers passkey and mints NFT with passkey signature
• Run 03-manage-keys.ts — full key management lifecycle
• Verify examples work with fresh keypair (no .env PRIVATE_KEY)
• Verify 02-passkeys.ts auto-delegates if run before 01

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1bd22cd0-adb1-4b96-aac9-669c191bf3b3

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}