nsz 4.6.1 rejects --keys and loads keys.txt beside argv[0] during import.
Run the converter in its temporary output folder with the selected key
file linked there before import, using absolute input and output paths.
Remove the temporary link on both successful and failed conversions.
Integrate PR #204 with XCZ and relative-path regressions, rename the test
flag that shadowed unittest.TestCase.fail, and qualify the documentation
for the verified nsz release. Record the packing finding and provenance.
Validation: reproduced the exact parser failure using real nsz 4.6.1;
a synthetic NSZ conversion verifies selected-key lookup and link cleanup;
52 NSP tests, four documentation tests and git diff --check pass.
The synthetic payload is unencrypted and uses dummy keys. Real-game
decryption, actual XCZ conversion and a full IPA build remain unverified.
Co-authored-by: Fernando Messias <fernandomessias95@gmail.com>
