fix(dr-egeria): fix silently-dropped/mis-mapped attributes found by new consumption audit

[dwolfson]

Summary

Adds scripts/dr_egeria_attribute_consumption_audit.py, a static audit that checks whether every compact-spec attribute is actually read by its Dr.Egeria processor, and whether Reference Name/Reference Name List attributes are read with the matching guid/guid_list cardinality key. Used it to find and fix a wide batch of silently-dropped or mis-mapped attributes, plus two pyegeria SDK/model bugs it led to. Full root-cause writeups for every issue are in PYEGERIA_ISSUES.md (ISSUE-97 through ISSUE-106).

• guid vs guid_list cardinality mismatches (In Data Specification/Structure/Dictionary/Field) leaving singular references unlinked
• Digital Product's Current Version never mapped (and Product Status/Type removed as spec cruft with no real DTO field)
• Purpose silently dropped on ~30 Collection-family commands despite being a required field
• Data Lens's 9 fields, Data Grain's 3 fields, and Data Field's Position/Min/Max Cardinality never mapped
• Link Agreement Terms and Conditions declared the wrong relationship type entirely (CollectionMembership instead of the real AgreementItem)
• Link Associated List had no implementation at all (always raised NotImplementedError); wired via the existing generic MetadataExpert.create_related_elements mechanism
• Create Glossary was unconditionally applying both Taxonomy and CanonicalVocabulary classifications regardless of user input
• pyegeria: InitialClassifications' serializer popped the wrong dict key after by_alias=True dumping, silently dropping every classification property beyond class across the whole SDK
• several case-mismatched/phantom-key attribute lookups (Allow Duplicates, Media Type Other Id, Dependency Description, etc.)
• 10 compact-spec attributes removed as confirmed cruft (no backing field anywhere in the live Egeria type system)

Test plan

• pytest tests/micro-tests -m unit passes, no regressions
• validate_compact_specs: 0 errors
• Every fix verified live against qs-view-server with throwaway elements — created, fetched back to confirm the actual persisted values, then deleted
• scripts/dr_egeria_attribute_consumption_audit.py re-run scoped to every touched command: 0 findings

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