Replace single-line version suffix assembly with an extensible two-array
approach: artifact_version_parts (associative, key=value) and
artifact_version_part_order (indexed, "NNNN-KEY" for sortable insertion).
Extensions can add, modify, or remove parts via the
artifact_kernel_version_parts hook. Keys starting with "_" are
internal-only and not prefixed in the output.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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