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GetNextDerivationIndex passed over a vault whose vault-metadata.json could not be read or parsed, so the next vault made from the same mnemonic could get that vault's derivation index and so the same long-term key. It now returns an error naming the file, and vault create, vault import and init stop before writing anything. A vault directory with no metadata file is still skipped. The regression test breaks one vault's metadata, once with content that does not parse and once with a test filesystem that fails to open it, and requires CreateVault with the same mnemonic to fail, naming the file, and leave no new vault. Model: opus-5-5