OptionaldefinedEvery currently-loaded model as the evaluator sees it (#5138 PR 7a: the
caller — the viewer's evaluatorModelsFromState or the CLI's
loadModelForDelivery — builds this list; the engine no longer knows
about a "model tag state" shape).
OptionalonOptionalsignal
Every tag id that currently exists, for
modelTagrule resolution (plan: a rule naming a since-deleted tag is UNRESOLVED, never silently broad). Omit when the caller has no tag concept (e.g. the CLI).