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Get Test Plan Version

GET 
/test-plans/:ref/versions/:version

One published version of name, plus its columns resolved against the workspace's current op registry — not the catalogue it published against. Immutability covers the plan's stored inputs, not the metric code reading them (see TestPlanRecord's docstring), so required_columns, unresolved_metrics, metric_drift and unresolved_metric_configs can legitimately differ between two reads of one version. metric_drift is where that difference is named: each metric's stored receipt of what it resolved to at publish, against what it resolves to now.

When ref is a version id, it already identifies one row, so a {version} that names a different one is refused rather than served — an id here means "this version", not "any version of this lineage" the way it does on the other two {ref} routes.

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