Release 2.8.2: move settle set to pympp 0.11 + x402 2.21 (verified) (#130)

## Summary

Releases `agentscore-commerce` 2.8.2, moving the coupled MPP settle set
forward: **pympp 0.10.1 -> 0.11.0** and **x402 2.20.0 -> 2.21.0**. Both
were verified against the registry's gate (run in full this time, not
deferred):

- **pympp 0.11** switches credential canonicalization to **RFC 8785 /
JCS**, which is exactly what mppx 0.9.1 (the JS counterpart) already
uses — so the two implementations *align* rather than diverge. pympp has
no EIP-712 zero-amount proof (that domain-v3 mechanism is mppx-only), so
the mppx-0.8.0 break class does not apply. 0.11's `Mpp.create` now reads
`.name` off each method; the one test that stubbed a bare `object()` is
updated to a method-shaped stub.
- **x402 2.21** leaves the Base mainnet USDC EIP-712 domain unchanged
(all `USD Coin` entries still `version: "2"`); 2.21 only refactored
`constants.py` into `default_assets.py`. No wire change on the rail we
settle.

## Type of change

- [x] Docs, tests, or internal maintenance only
- [ ] Bug fix (no breaking change)
- [ ] New feature (no breaking change)
- [ ] Breaking change (existing callers must update)

## Public API

None. No exported symbols or wire formats changed; this bumps two
peer-dep versions and updates one test stub for pympp 0.11's `.name`
method contract.

## Test plan

`uv run pytest` (1868 passed, 4 skipped, 95.37% coverage), `uv run ruff
check` + `ruff format --check` + `uv run ty check` all clean — ty
validates the pympp-0.11 / x402-2.21 API surface our code calls.
Standing obligation: a live all-rails settle against a pympp-0.11
merchant is the final cross-implementation confirmation and runs as a
post-deploy smoke.

## Checklist

- [x] Tests cover the new behavior, and the suite passes locally
- [x] Lint, format, and type checks pass
- [x] Docs and README examples updated if the public surface changed
- [x] No secrets, credentials, or personal data in the diff or the tests

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: vvillait88

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "agentscore-commerce"
-version = "2.8.1"
+version = "2.8.2"
 description = "Agentic commerce SDK for Python: identity middleware (FastAPI, Flask, Django, AIOHTTP, Sanic, ASGI) + payment helpers + 402 builders + discovery + Stripe multichain. The full merchant-side toolkit for AgentScore-powered agentic commerce."
 readme = "README.md"
 license = "MIT"

tests/test_payment_servers.py

@@ -10,6 +10,7 @@
 from __future__ import annotations
 
 import importlib.util
+from types import SimpleNamespace
 from typing import Any
 
 import pytest
@@ -448,11 +449,13 @@ async def test_create_mppx_server_stripe_rail_resolves(monkeypatch: pytest.Monke
 
     ``create_mppx_stripe`` is stubbed because the installed pympp build doesn't ship a
     working ``stripe/charge`` factory; this exercises the stripe branch (resolve + break)
-    in ``create_mppx_server`` without depending on that peer-dep detail.
+    in ``create_mppx_server`` without depending on that peer-dep detail. pympp >=0.11's
+    ``Mpp.create`` reads ``.name`` off each method for its uniqueness check, so the stub
+    returns a method-shaped object carrying one rather than a bare ``object()``.
     """
 
     async def _fake_create_stripe(**_kwargs: Any) -> Any:
-        return object()
+        return SimpleNamespace(name="stripe")
 
     monkeypatch.setattr("agentscore_commerce.stripe_multichain.mppx_stripe.create_mppx_stripe", _fake_create_stripe)
     server = await create_mppx_server(