feat: Java-free decode via zxingcpp fallback#11
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Add zxingcpp as the preferred decode backend (no JVM required), falling back to python-zxing for legacy environments. Normalises zxingcpp's <GS> token to raw \x1d so GS1 group separator payloads round-trip correctly. - decode() tries zxingcpp first (pip install 'aztec-py[decode-fast]') - Falls back to python-zxing if zxingcpp absent - Raises RuntimeError with install instructions if neither is present - New decode-fast extra in pyproject.toml: zxingcpp>=2.2 + pillow - 3 new tests covering fast path, empty result, and fallback behaviour - All 97 tests pass, coverage 91%
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Summary
decode()now trieszxingcppfirst (pure C++, no JVM) and falls back topython-zxingdecode-fastoptional extra:pip install "aztec-py[decode-fast]"<GS>token to raw\x1dfor correct GS1 group separator roundtripRuntimeErrormessage lists both install options when neither backend is presentTesting
Notes / Risks
python-zxingis installed