docs(ack-pay): align receipt API examples

[EfeDurmaz16]

Summary

• update the ACK-Pay README receipt verification example to use trustedReceiptIssuers, matching the exported verifyPaymentReceipt options
• remove the README reference to unexported isPaymentReceiptClaim and import the exported receipt credential guard
• align the receipt verification docs example with the SDK credential type PaymentReceiptCredential

Why

The README currently shows trustedIssuers, but verifyPaymentReceipt accepts trustedReceiptIssuers. It also references isPaymentReceiptClaim, which is internal to receipt-claim-verifier.ts and is not exported from @agentcommercekit/ack-pay.

Verification

• corepack pnpm install --frozen-lockfile
• corepack pnpm check:format
• git diff --check
• corepack pnpm --filter @agentcommercekit/ack-pay check:types initially failed because workspace package exports resolve from built dist outputs
• corepack pnpm --filter @agentcommercekit/ack-pay... build
• corepack pnpm --filter @agentcommercekit/ack-pay check:types

Notes

This is docs-only and avoids the receipt verification logic changed in #88.

AI Usage Disclosure

This contribution was AI-assisted using Codex CLI and the Codex app. AI assistance was used for repository/docs navigation, understanding ACK/Catena context, identifying relevant issues or contribution areas, and assisting with small edits/validation. I reviewed the final diff and take responsibility for the submitted changes.

Summary by CodeRabbit

Documentation

• Updated payment receipt verification examples to reflect current credential taxonomy (PaymentReceiptCredential) and trust configuration patterns with trustedReceiptIssuers
• Refreshed type guard validation examples to showcase the latest utilities for validating payment receipts and requests

[coderabbitai]

Walkthrough

This pull request updates documentation for the ACK receipt payment verification feature. The credential type example is changed from ACKPaymentReceipt to PaymentReceiptCredential, and the README's verification examples are updated to show the correct issuer trust configuration and type guard imports.

Changes

ACK Receipt Verification Documentation

Layer / File(s)	Summary
Updated credential type and API documentation docs/ack-pay/receipt-verification.mdx, packages/ack-pay/README.md	Receipt verification credential type updated from ACKPaymentReceipt to PaymentReceiptCredential. README verifyPaymentReceipt example switched from trustedIssuers to trustedReceiptIssuers, and type guards documentation now imports and demonstrates isPaymentRequest and isPaymentReceiptCredential.

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🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'docs(ack-pay): align receipt API examples' directly corresponds to the main changes: updating receipt verification examples in documentation to align with the current ACK-Pay API.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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