docs: spec for selecting multiple statuses in a filter

I wrote a spec for letting a filter match several workflow states at once. The builder picks one state today, so "Todo or In Review" can't be built. The design makes :state polymorphic, a name or a list of names, mirroring how :state-type already works, so (:state ("Todo" "In Review")) compiles to state.name.in.

It covers the four filter-side readers (compiler, builder, validator, reverse-compile), reconciles the views spec's representability boundary, and notes the issue's own state field is a separate, unaffected use. Codex review incorporated. Status Ready.

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