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Add tests/integration/test_differential_parity.py plus a shared parity_harness.py and a data-driven parity_caveats.py allowlist. The gate runs real rsync 3.4.1 and FastSync over the same corpora, compares the destination trees (paths, hashes, symlink targets, modes, hard-link grouping) and the normalized -i/--stats/--out-format output, and fails on any difference not listed in the allowlist. Stale allowlist entries warn (or fail under FASTSYNC_PARITY_STRICT=1) so the residual list shrinks. Register parity/parity_ci markers and wire a fast PR job (parity_ci) plus a push-only full job (parity, strict) into .gitea/workflows/ci.yaml. Document the gate and the allowlist workflow in tests/integration/README.md.