v0.2.0

Added

• AsyncGuardedPayment and cycles_guard_payment_async(...) — async-context-manager variant for asyncio runtimes (FastAPI, anyio, OpenAI async SDK, etc.). Same exception classes as sync plus one async-only condition (cancellation mid-commit, see below). Same idempotency-key derivation (including the open-mandate consume-once scope) and same commit-uncertainty handling as the sync GuardedPayment.
• New example examples/ap2_human_not_present_async.py.
• README "Async variant (v0.2+)" quickstart snippet.
• 37 tests in tests/test_async_guard.py mirroring the sync test surface (clean commit, dry-run, denial, release on exception, commit-uncertain branches incl. cancellation, commit-failed branches incl. release-failure recording, AP2 sample-type adapter end-to-end). Total 147 tests, 99.20% coverage. ruff + mypy strict.

Changed (async-only)

• AP2GuardCommitUncertain gains one new error_code value, "COMMIT_CANCELLED", raised when an asyncio.CancelledError lands while the async commit POST is in flight. The exception class itself is unchanged; only the set of error_code discriminators grew. Sync callers see no change.

Unchanged

• No wire-shape changes. No validation changes. No sync API changes — existing v0.1.x sync callers see the API entirely unchanged.

Still planned for v0.3

• Multi-currency.
• payment.refund helper.
• Server-verifiable runtime-authority receipt (requires cycles-protocol signed-receipt field).