Decompose entity inheritance hierarchy into traits and interfaces with composition#1172

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Copilot wants to merge 9 commits intomasterfrom

copilot/decompose-entity-inheritance

Commits on Jan 2, 2026

Initial plan
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Extract entity functionality into traits and interfaces

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Add documentation for entity refactoring

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Add trait dependency documentation and architecture diagrams

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Fix code review issues: typos, docblock consistency, and null checks

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Address additional code review feedback: trait dependencies and grammar

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Add comprehensive implementation summary document

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Commits on Jan 3, 2026