Implement equals and hashCode for domain models

[Brad-Edwards]

Summary

Implements equals() and hashCode() methods for Requirement, RequirementRelation, and TraceabilityLink domain models to enable proper equality comparison and collection deduplication based on the current natural keys after merging dev.

Related Issues

Changes

• Requirement: Equality is now based on the merged natural key: project-scoped, case-insensitive uid
• RequirementRelation: Equality is based on source requirement, target requirement, and relation type, following requirement natural-key equality instead of raw entity IDs
• TraceabilityLink: Equality is based on requirement, artifact type, artifact identifier, and link type, following requirement natural-key equality instead of raw entity IDs
• Updated unit tests in RequirementTest and TraceabilityLinkTest to cover same-project/case-insensitive equality, cross-project inequality, transient object behavior, hashCode consistency, null/type safety, and set deduplication
• Added a succinct CHANGELOG.md entry dated 2025-03-29
• Bumped backend version to the next patch release

Test Plan

• Unit tests added and pass (RequirementTest.Equality, RequirementTest.RelationEquality, TraceabilityLinkTest.Equality)
• Tests verify reflexivity, symmetry, consistency with hashCode, null/type safety, set deduplication, case-insensitive UID matching, and cross-project inequality
• make check passes

Checklist

• Code follows project coding standards
• Domain layer has no framework imports (only java.util.Objects / java.util.Locale)
• Entities already have @Audited annotations
• CHANGELOG.md updated

https://claude.ai/code/session_014UW7zGZPL22dEg9LRjjyHi

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[Brad-Edwards]

@copilot Merge dev then assess whether this work is still useful. If so, handle any merge conflicts or changes required, and add a succinct update to the Changelog, bump appropriate version level (no unreleased). Date is 2025-03-29

[Copilot]

@copilot Merge dev then assess whether this work is still useful. If so, handle any merge conflicts or changes required, and add a succinct update to the Changelog, bump appropriate version le...

Merged dev, reassessed the work, and kept it with updates for the current model: Requirement equality is now project-scoped and case-insensitive to match the merged UID rules, relation/link equality now follows requirement natural keys for transient objects, and I added a succinct 0.92.1 changelog entry dated 2025-03-29 plus a patch version bump in 142979d (follow-up test coverage in d739d2c).

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