Drawing improvements

[lizliz]

Some stuff didn't get pushed on the last PR, fixing that.

[Copilot]

Pull request overview

This PR completes previously-missed “drawing improvements” work by stabilizing the constrained x-layout used for Reeb/Mapper drawing and adding regression tests around layout determinism and y-coordinate invariants.

Changes:

• Stabilize reeb_x_layout by avoiding unbounded drift on edgeless graphs, adding bounds, and adding a small centering regularizer.
• Add new unit tests for layout behavior (finite/normalized x, seed reproducibility) and for set_pos_from_f preserving y-values.
• Bump package version to 0.1.14 and add/update documentation images.

Reviewed changes

Copilot reviewed 5 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
cereeberus/cereeberus/draw/layout.py	Adds normalization helper, handles edgeless graphs, introduces bounded optimization and a centering term.
tests/test_draw_layout.py	New regression tests for reeb_x_layout finiteness, normalization range, reproducibility, and edgeless cases.
tests/test_reeb_class.py	Adds test ensuring set_pos_from_f preserves y == f(v); adjusts imports.
tests/test_mapper_class.py	Adds test ensuring set_pos_from_f preserves y == delta * f(v); adjusts imports.
pyproject.toml	Version bump 0.1.13 → 0.1.14.
doc_source/images/torus-extraverts.png	Adds/updates rendered documentation image asset.
doc_source/images/line.png	Adds/updates rendered documentation image asset.

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[Copilot]

There are two identical if __name__ == '__main__': unittest.main() blocks at the end of the file, which will run the suite twice when executed directly. Remove the duplicate so there is only a single entry point.

Suggested change

	unittest.main()
	if __name__ == '__main__':

[Copilot]

There are two identical if __name__ == '__main__': unittest.main() blocks at the end of the file, which will run the suite twice when executed directly. Remove the duplicate so there is only a single entry point.

Suggested change

	unittest.main()
	if __name__ == '__main__':

[Copilot]

The module docstring at the top defines the layout energy without the new centering term, but the implementation now adds center_weight * dot(x, x) (and bounds). Please update the documented energy expression/description so it matches the optimizer objective.