fix: Three bugs in WeakSINDy/EmptyLibrary from code review

[Copilot]

Code review of the WeakSINDy PR uncovered three bugs.

Changes

• EmptyLibrary.transform shape error (feature_library/base.py): np.empty((x.shape[:-1], 0)) wraps the shape in a nested tuple, causing a TypeError at runtime. Fixed to np.empty((*x.shape[:-1], 0)).

• WeakSINDy.set_params missing return value (_weak.py): Violated the sklearn convention of returning self, breaking method chaining (model.set_params(...).fit(...)). Added return self.

• Variable shadowing in _plan_weak_form (_weak.py): for lib in lib.libraries: shadowed the function parameter, with a nested for lib in lib.libraries generator compounding the issue. Renamed loop variables to sublib/sl to eliminate the shadowing.

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[Jacob-Stevens-Haas]

This works well, but I changed some names and will push directly to _weak.

Is there a way to change your commit behavior? I didn't like that you had a commit message title exceeding 72 characters and that you created an empty "Initial Commit" commit