Add DeferredLinearExpression for lazy merge of disjoint-dimension expressions#13

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FBumann wants to merge 13 commits intomaster_orgfrom

feature/defered-merge

Commits on Feb 1, 2026

Implement DeferredLinearExpression
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Implement DeferredLinearExpression
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Add benchmakr script
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Optimize DeferredLinearExpression sum path for disjoint dims
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Issue 1 — .flat/.to_polars() wrong results for overlapping dims: Removed the fast-path concat shortcuts entirely. Both now delegate to .materialize() which ensures correct
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Update benchmark_deferred_merge.py
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Add lp file write
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Where deferred fully avoids materialization (no OOM possible):
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Per-part dispatch for dimension operations — when dims are disjoint, these operations apply only to the parts that contain the target dimensions, leaving other parts
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bench: update benchmark_deferred_merge.py
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bench: update benchmark_deferred_merge.py
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Add benchmark findings
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fix: removed the _has_disjoint_dims() guard from .flat and .to_polars() so they always concat per-part, and updated the test to match the new
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