feat(composition): fragments join the properties of a subject, and a set two fragments declare differently is refused - #3

feat(composition): fragments join the properties of a subject, and a set two fragments declare differently is refused#3

FBumann wants to merge 2 commits into

claude/sets-properties-prototype-9m3zu6-2-callsfluxopt/mathspec:claude/sets-properties-prototype-9m3zu6-2-callsfrom

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