refactor: make definition optional with EmptyDefinition sentinel#302

Merged

ocots merged 9 commits intomainfrom

Apr 20, 2026

Commits on Apr 19, 2026

refactor(display): split print.jl into focused files
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Make definition optional: EmptyDefinition sentinel, refactor Display
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tests: add/fix tests for AbstractDefinition hierarchy and optional definition
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tests: fix remaining definition type errors in test_ocp.jl and test_ocp_solution_types.jl
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fix: add DefinitionType parameter to Model type signatures in model.jl
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feat: add expression getter for AbstractDefinition, PreModel, and Model
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refactor: move definition setters/getters to Components/, Model getters to Building/model.jl
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docs: update BREAKING.md and CHANGELOG.md for definition refactor in 0.9.15
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docs: remove false breaking change about PreModel definition getter (never published)
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