Summary

Update @peac/adapter-x402 to track the current x402 offer-receipt extension at the raw wire layer. The adapter keeps PEAC's normalization, verification helpers, and record mapping above that wire format without changing x402 payload semantics.

Scope

• @peac/adapter-x402 source
• adapter tests and conformance bridge
• package README
• weather-proof example

No kernel, schema, protocol, or other adapter source changes.

What changed

• raw wire types now follow the current x402 offer-receipt shapes
• JWS and EIP-712 artifacts use discriminated unions
• JWS artifacts omit payload at the envelope level
• EIP-712 placeholder values are normalized in a separate layer
• verification is split into wire, offer, receipt, and consistency checks
• record mapping preserves raw proofs and produces normalized evidence fields
• README and example were updated to match the current adapter API

x402 compatibility

• signature remains the field name for both JWS and EIP-712 artifacts
• offer-receipt remains the extension key
• adapter defaults follow the current x402 extension behavior for expiry and receipt recency

Adapter policy surfaces

These behaviors are adapter-level and are separate from x402 wire semantics:

• placeholder normalization
• configurable expiry policy
• network-aware address comparison
• optional signer authorization hooks
• record mapping into PEAC evidence structures

API changes

• version is now numeric
• receipts now use resourceUrl, payer, issuedAt, and transaction
• offers are now offers[]
• acceptIndex is per-offer
• AcceptEntry.scheme is required
• AcceptEntry.settlement is removed
• X402OfferReceiptChallenge is a post-extraction convenience type, not the upstream wire message

Validation

• build
• typecheck
• lint
• adapter tests
• conformance tests
• guard script
• package smoke check

Not included

• no x402 payload changes
• no authorization hints in signed payloads
• no fixture rewrite yet
• no compatibility drift CI yet

Follow-ups

• replace the conformance bridge with native current-shape fixtures
• add pinned upstream compatibility CI and drift checks
• update broader repo-level docs where needed