build: upgrade to itkwasm-downsample 2.0.1

[vboussot]

Follow-up from #626 (comment).

• Require itkwasm-downsample 2.0.1 in both ports and refresh the lockfiles.
• 2.0.1 fixes the pipeline abort while reconstructing B-spline transforms, so itk_transform_resample_bounding_box now takes an itk.BSplineTransform (and the affine + B-spline composite a registration returns) directly; covered by two new tests and the limitation note is removed from the docs.
• The downsampled pixels are bit-for-bit unchanged; only the multiscales metadata's recorded downsampler version moves to 2.0.1. That provenance field is now excluded from the baseline metadata comparison so future upgrades stop forcing baseline-archive rebuilds.

Full py bounding-box/downsampling suites and the TS suite (484 tests) pass locally against 2.0.1.

Summary by CodeRabbit

• Bug Fixes

  • Improved metadata comparisons so expected version-related differences no longer cause failures.
  • Updated downsampling integration to use the latest compatible release.

• Tests

  • Added coverage for B-spline and combined affine/B-spline transform bounding boxes.
  • Added regression coverage to ensure only expected provenance differences are ignored.

• Documentation

  • Simplified ITK transformation documentation by removing outdated failure notes and parameterization details.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📥 Commits

Reviewing files that changed from the base of the PR and between c159863 and 4c59a5f.

📒 Files selected for processing (2)

• py/test/_data.py
• py/test/test_baseline_guard.py

🚧 Files skipped from review as they are similar to previous changes (1)

• py/test/_data.py

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📝 Walkthrough

Walkthrough

The change requires itkwasm-downsample 2.0.1, adds B-spline bounding-box tests, narrows metadata comparison exclusions, and removes an outdated ITK documentation note.

Changes

Resampling and metadata validation

Layer / File(s)	Summary
Downsample 2.0.1 and B-spline coverage py/pyproject.toml, ts/deno.json, docs/itk.md, py/test/test_itk_transform_resample_bounding_box.py	Python and Deno now require itkwasm-downsample 2.0.1. Tests cover direct identity B-spline transforms and affine-plus-B-spline composites. The outdated ITK limitation note is removed.
Metadata version comparison py/test/_data.py, py/test/test_baseline_guard.py	Metadata comparison ignores multiscales version fields at supported paths. Regression tests verify that nested look-alike paths remain significant.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related PRs

• fideus-labs/ngff-zarr#628: Updates the same dependency and metadata-comparison areas.
• fideus-labs/ngff-zarr#632: Provides related B-spline transform bounding-box functionality.

Suggested reviewers: thewtex

Poem

A rabbit bounds through splines bright,
With boxes measured left and right.
Downsample wears a newer tag,
Metadata guards each flag.
Old notes fade; new tests glow—
Clean paths guide the code to go.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the primary change: upgrading itkwasm-downsample to version 2.0.1.
Docstring Coverage	✅ Passed	Docstring coverage is 83.33% which is sufficient. The required threshold is 80.00%.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@py/test/_data.py`:
- Around line 272-276: Update the exclude_regex_paths configuration in the test
data to match only the supported root .zattrs paths: direct root metadata and
consolidated metadata under ['metadata']['.zattrs']; anchor each alternative so
DeepDiff’s re.search() cannot match nested paths. Add pytest coverage verifying
allowed provenance changes in those paths and rejecting equivalent nested
metadata changes.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 9b24aac9-147d-4be1-a3be-f5e3e08f358e

📥 Commits

Reviewing files that changed from the base of the PR and between 86e3e69 and c159863.

⛔ Files ignored due to path filters (2)

• py/pixi.lock is excluded by !**/*.lock
• ts/deno.lock is excluded by !**/*.lock

📒 Files selected for processing (5)

• docs/itk.md
• py/pyproject.toml
• py/test/_data.py
• py/test/test_itk_transform_resample_bounding_box.py
• ts/deno.json

💤 Files with no reviewable changes (1)

• docs/itk.md