feat(panel): track panel sources and concatenate panels

[Aratz]

Summary

• A panel is one or more PanelSources. name, version, and the other single-source properties raise unless the panel has exactly one source.
• concatenate joins panels. Equality ignores source order.
• Stacks on the hashing-marker pull request. The patch-alignment pull request is based on this branch.

Test plan

• CI passes (ruff, ruff format, mypy, pytest)
• Concatenation, equality, replace_source, and source_as_panel tests pass
• Adding a multi-source panel through config is rejected

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Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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Negative source index mishandles markers

Low Severity

replace_source and source_as_panel use the same integer as a Python list index and as a marker_source_ids value. Negative indexes select a source from sources but match no marker ids, so replace_source(-1, ...) keeps every original marker, attaches replacement rows under id -1, and overwrites the last source's metadata.

Additional Locations (1)

• src/pixelator/pna/config/panel/antibody_panel.py#L499-L518

 

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