Add BCAL experimental package evaluations (test feed bcal cli)

[martinsrui-msft]

Summary

• add official-latest, official-pinned, and experiment-pinned BCAL package options
• install exact experimental packages from a secret-configured feed
• publish package channel, branch/PR, and version metadata to Kusto

Validation

• 167 focused tests passed
• experimental package smoke test passed
• full experimental evaluation

AB#653013

[github-code-quality]

Code Coverage Overview

Languages: Python

Python / code-coverage/pytest

The overall line coverage in commit 58cc89b in the bcal/branch-evaluati... branch remains at 88%, unchanged from commit 1b36165 in the main branch.

Show a line coverage summary of the most impacted files.

File	main 1b36165	bcal/branch-evaluati... 58cc89b	+/-
src/bcbench/com...nds/evaluate.py	79%	78%	-1%
src/bcbench/types.py	92%	92%	0%
src/bcbench/results/base.py	95%	95%	0%
src/bcbench/res...ceval_export.py	95%	95%	0%

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_{Updated October 13, 2026 13:15 UTC}