Fold check-ascii-mdl, fix-mdl-model-names, check-duplicate-names, and
clean-duplicate-names out of sow-assets-manifest into `crucible assets`
(seven commands total), via a shared internal/assets/mdl port of
mdl-name-lib.sh + mdl-scan.awk. Consumer keeps the awk libs for import.sh's
hot-path gate; moving import.sh into `crucible depot` is a decomposed
follow-up spec.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
archvillainetteandClaude Opus 4.8
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