Demo firmware runs clean decode + noisy decode (vector 0) and reports
pass/fail on GPIO[7:0]. All 5 cocotb tests pass: ldpc_basic, ldpc_noisy,
ldpc_max_iter, ldpc_back_to_back, and ldpc_demo.
Also adds .cf/project.json with GPIO configuration.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add test_data.py (cocotb Python module) and test_vectors.h (C header)
with 20 test vectors from the Python behavioral model. LLR data is
packed 5 per 32-bit word matching the wishbone interface format.
11 converged vectors for positive testing, 9 non-converged for
negative testing.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
