Add anisotropic edge-case tests for SegResNetDS shape validation

[Talhax55z]

Follow-up to #8797.

While working on the anisotropic analysis in #8797, I noticed that shape_factor() and is_valid_shape() in SegResNetDS had no direct unit test coverage for the anisotropic path. This PR adds tests for:

• isotropic mode across 2D and 3D
• anisotropic mode with resolution set
• valid and invalid inputs to is_valid_shape()
• mixed validity (one dimension invalid, others valid)
• the ValueError raised by the forward pass on invalid shapes

No runtime code changed. This is a test-only contribution.

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📝 Walkthrough

Walkthrough

Adds tests/test_segresnet_ds.py. The test suite checks shape_factor() for isotropic and anisotropic 2D and 3D configurations. It checks is_valid_shape() for divisible and non-divisible shapes. It also checks that a forward pass raises ValueError for invalid spatial dimensions.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to e7e97

This change adds coverage for SegResNetDS shape validation without changing runtime behavior, so it is ready to merge with normal checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the added anisotropic edge-case tests for SegResNetDS shape validation.
Description check	✅ Passed	The description clearly explains the motivation, test coverage, and test-only scope. It omits the repository template headings, issue reference, and checklist, but it contains the critical change info…
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 1 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In `@tests/test_segresnet_ds.py`:
- Line 23: Add Google-style docstrings to the test methods
test_shape_factor_isotropic and the other definition lines identified in this
test module, documenting each parameter and the behavior under test; preserve
the existing parameterization and assertions.

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• tests/test_segresnet_ds.py

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