Clarify provisioning mint helper documentation

[coderabbitai]

Update mint.rs docstrings to explain template key syntax and byte-based atom wrapping, origin slug failure cases, file action reporting and Unix permissions, and error handling for mise locking and engine output. No runtime behavior changes.

Validation: git diff --check passed for the pinned diff. Tests were not run (documentation-only changes).

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[coderabbitai]

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