Feat/python select

[mathleur]

Description

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[Copilot]

Pull request overview

This PR extends the Rust Qube functionality with dimension-removal utilities and exposes additional APIs in the Python bindings, including selection and introspection helpers.

Changes:

• Added Qube::drop() (dimension splicing/removal) and Qube::squeeze() (drop dimensions with only one coordinate), plus Rust unit tests.
• Added PyQube.select(), PyQube.all_unique_dim_coords(), and PyQube.compress() to the Python bindings.
• Added Python tests for select, all_unique_dim_coords, and compress, and updated the arena JSON roundtrip test to match the current JSON envelope shape.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 7 comments.

File	Description
qubed/src/qube.rs	Adds dimension dropping/splicing (drop, squeeze) and associated Rust tests.
py_qubed/src/lib.rs	Exposes new Python APIs (select, all_unique_dim_coords, compress) over the Rust core.
py_qubed/tests/test_select_api.py	Adds pytest coverage for Python select and related APIs.
py_qubed/tests/test_qubed_api.py	Updates JSON parsing expectations for to_arena_json() output shape.

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[Copilot]

Pull request overview

This PR extends the core qubed functionality with dimension-removal utilities (drop/squeeze) and exposes the existing Rust select API to Python, aligning Python tests and coordinate parsing behavior with the ASCII “/-separated” coordinate format used across the codebase.

Changes:

• Added Qube::drop() (dimension splicing) and Qube::squeeze() (drop dimensions with only one unique coordinate) plus Rust unit tests.
• Fixed Coordinates::from_string() to split on / (matching to_string() and ASCII conventions).
• Added Python bindings and tests for select, all_unique_dim_coords, compress, drop, and squeeze; updated arena JSON test expectations.

Reviewed changes

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

Show a summary per file

File	Description
qubed/src/qube.rs	Implements drop/squeeze via subtree splicing + compression; adds unit tests.
qubed/src/coordinates/mod.rs	Makes from_string parse /-separated coordinates to match serialization/ASCII.
py_qubed/src/lib.rs	Adds Python-facing select, all_unique_dim_coords, compress, drop, squeeze bindings.
py_qubed/tests/test_select_api.py	New pytest coverage for Python select/drop/squeeze/etc APIs.
py_qubed/tests/test_qubed_api.py	Updates arena JSON test to expect {version, qube} object shape.

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