Uptake latest bc-eval package for storage options and LMchecklist

[haoranpb]

Uptake the latest version of bc-eval package for:

1. Storage options (also upload results to Kusto)
2. LMchecklist

Also some refactoring to make sure it is easier to add future categories.

• Stop upload result for test runs before merge the code

[Copilot]

Pull request overview

This PR updates BC-Bench to align with newer bc-eval capabilities (storage options + LMChecklist-style expected outputs) and adds small CLI helpers so workflows can derive bc-eval configuration from the selected evaluation category.

Changes:

• Extend dataset entries to support ExpectedOutput as either a patch string or an LMChecklist-style assertions payload.
• Add EvaluationCategory.evaluators and EvaluationCategory.core_score plus a bcbench category bceval-config CLI command for GitHub Actions step outputs.
• Update CI/workflows to use the new category CLI and upgrade the bc-eval tool installation + invocation parameters.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/test_type_exhaustiveness.py	Updates expected-output assertions and adds exhaustiveness tests for new evaluators/core_score properties.
tests/test_result_writer.py	Adds coverage ensuring dict-based expected payloads are preserved in exported JSONL.
tests/test_category_command.py	New tests for bcbench category list and bcbench category bceval-config.
src/bcbench/types.py	Adds EvaluationCategory.evaluators and EvaluationCategory.core_score.
src/bcbench/results/bceval_export.py	Types expected as ExpectedOutput to allow dict payloads in JSONL export.
src/bcbench/dataset/dataset_entry.py	Introduces Checklist/ExpectedOutput type aliases and widens get_expected_output() return type.
src/bcbench/dataset/init.py	Re-exports ExpectedOutput.
src/bcbench/commands/category.py	New CLI commands for category listing and bc-eval config emission to $GITHUB_OUTPUT.
src/bcbench/commands/init.py	Exposes category_app.
src/bcbench/cli.py	Registers the new category command group.
.github/workflows/summarize-results.yml	Uses bcbench category bceval-config, upgrades bc-eval install, and switches to --storage-based publishing.
.github/workflows/CI.yml	Selects random category via bcbench category list (adds checkout + uv setup for that job).