Dematerialize mixs.yaml generation: remove verbosity from induced schema

[turbomam]

Addresses #2663 by removing readonly metaslot assertions from generated mixs.yaml.

Replaces this (but keep branch 2663-dont-assert-read-only-slots)

• 2663 don't assert read only slots #2688

Changes

Apply comprehensive dematerialization pipeline to mixs.yaml generation:

• Remove all 12 readonly metaslots: source_file, from_schema, owner, domain_of, is_usage_slot, usage_slot_name, alias, definition_uri, imported_from, metamodel_version, source_file_date, source_file_size, generation_date
• Simplify ExpandedDict → SimpleDict: prefixes, settings, annotations
• Remove redundant key fields: class names, slot names, enum names, slot_usage names, subset names, permissible_values text
• Remove 489 redundant aliases that duplicate title field
• Conditionally remove domain (except MixsCompliantData)

Results

• 35.9% reduction in lines: 11,837 → 7,587 (4,250 lines removed)
• 27.9% smaller file size: 344K → 248K (96K saved)
• Schema remains fully functional - all tests pass
• SchemaView correctly materializes compact YAML back to full objects on load

Files Changed

• project.Makefile: Added dematerialization transformations to mixs.yaml build target
• src/schema/mixs.yaml: Generated output (dematerialized)
• assets/other_mixs_yaml_files/mixs_template.yaml: Template adjustments

[github-actions]

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