Add Business ID permutation V1 - #40
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Closes #39.\n\nImplements the accepted pure daily-permuted-v1 foundation:\n- frozen core scope and defensive 256-bit versioned key types\n- eight-round HMAC-SHA256 Feistel permutation with cycle walking\n- exact six-character uppercase Base36 formatting\n- byte-identical canonical CSV and all 10 cross-language vectors\n- invalid scope/key/range checks, 20,000-value uniqueness and restart determinism\n- README boundary: this does not claim durable allocation or generated typed lifecycle\n\nVerification:\n- PYTHONPATH=src pytest -q (315 passed, 8 declared skips)\n- ./scripts/verify-examples.sh\n- python -m build --wheel (new modules included)\n- canonical CSV SHA-256 0b9fe148d139c2c545550f12fa14229f0311e8f6349bc4dea9ae6ee921c9e563