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Each command that changes the state directory holds one lock: flock(2) on `lock` in the state directory, dropped by the kernel if the process dies, or a process-wide mutex on the in-memory test filesystem. It covers the state directory, not each vault, because `currentvault`, `vault create` and cross-vault moves span vaults, and a lock file in a vault would be deleted by `vault remove` under a waiting command. Files go through `secret.WriteFileAtomic`; versions, new secrets and cross-vault copies are built in a temporary directory and renamed into place; removals rename out of the way first. An unlocker added under an existing unlocker's directory name is still rewritten file by file: #71. Model: opus-5-5