Adds a Ukrainian argument structure gallery example

[pkuchmiichuk]

Description

Adds a Ukrainian argument structure example to the gallery: an end-to-end 2AFC acceptability pipeline for Ukrainian verb argument structure, following the structure of gallery/eng/ and gallery/kor/. It ships a Makefile, a local config.yaml, and numbered pipeline stages covering lexicon generation, template generation, template filling, 2AFC pair construction, list partitioning, and jsPsych/JATOS deployment.

Ukrainian specifics worth noting:

• Lexicons are built from VESUM Unimorph adaptation rather than standard UniMorph that uses Wiktionary, via a UniMorphAdapter subclass in utils/vesum_adapter.py. This is enabled by a small, overridable _load_dataset hook added to UniMorphAdapter (bead/resources/adapters/unimorph.py), so a subclass can read a non-standard file layout without touching the rest of the adapter. The hook and its test are the only bead/ change in this PR.
• Pairs contrast morphological case rather than word order, since Ukrainian argument structure is case-marked. Case forms are filtered to unambiguous ones.
• Verb selection is frequency-based, driven by a committed wordfreq-derived table (resources/verb_frequencies.csv). build_frequencies.py regenerates it, but is meant to be run rarely so the pipeline does not depend on wordfreq at run time.
• Scoring uses a masked-LM scorer for pair construction and a causal LM for final scoring.

Depends on

This example relies on the core changes in the companion PR #11 against main (constraint-type defaults and the model dtype passthrough): generate_lists.py constructs constraints without restating constraint_type, and create_2afc_pairs.py passes a dtype.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Refactoring (no functional changes)
• Tests (adding or updating tests)

Checklist

• I have read the CONTRIBUTING guidelines
• My code follows the project's style guidelines
• I have run uv run ruff check . and uv run ruff format .
• I have run uv run pyright with no errors
• I have added tests that prove my fix/feature works
• All tests pass (uv run pytest tests/)
• I have updated documentation as needed

Testing

tests/resources/adapters/test_unimorph.py covers the one bead/ change: a subclass overriding _load_dataset is used in place of the module-level loader.

The Ukrainian pipeline itself is excluded from CI, matching how gallery/eng/ and gallery/kor/ are treated. Generated data is not committed. A gallery README.md documents the pipeline and how to run it.