Replace diff_engine_core submodule with subtree#145

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PTNobel wants to merge 3 commits intocvxpy-mergefrom

replace-submodule-with-subtree

Commits on Feb 8, 2026

Remove diff_engine_core submodule in preparation for subtree

PTNobel
and
claude
committed
Squashed 'diff_engine_core/' content from commit fa65481d
PTNobel
committed
Add diff_engine_core as git subtree (replacing submodule)

PTNobel
and
claude
committed