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Instead of a separate pnpm-lock.env.yaml file, the env lockfile (configDependencies and packageManagerDependencies) is now stored as the first YAML document in pnpm-lock.yaml, separated by `---`. The combined file starts with `---\n` when an env document is present, allowing pnpm to check just the first 4 bytes to know whether the file contains an env document. Reading uses streaming I/O that stops as soon as the document separator is found, avoiding parsing of the full lockfile. Writing preserves both documents: when the env lockfile is updated the main lockfile portion is kept, and vice versa.