feat: add detect_rail_from_headers helper - #24
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Returns "mpp" when Authorization: Payment is present, "x402" when payment-signature/x-payment is present, None otherwise. Case-insensitive header lookup per RFC 7230 §3.2; auth scheme matched per RFC 7235. In practice a client constructs a request with exactly one protocol's headers; if somehow both arrive (client bug or misconfigured proxy), MPP wins by checking it first. Documented as a tiebreaker, not a feature. Tests lock 14 cross-language fixtures with the @agent-score/commerce sibling. Parametrized so multiple drifts surface independently. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
\"mpp\"whenAuthorization: Paymentis present,\"x402\"whenpayment-signature/x-paymentis present,Noneotherwise.agentscore_commerce.payment.detect_rail_from_headers.Tests
@agent-score/commerce'sdetectRailFromHeaders.pytest.mark.parametrizeso multiple drifts surface independently.Test plan
uv run pytest tests/test_dispatch.py— 16 tests passuv run pytest— full suite 945 pass / 3 skip, coverage 95.05%uv run ruff check,uv run ruff format --check,uv run ty check— green🤖 Generated with Claude Code