feat(react): route element-template background tree via multi-slot#2651

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Commits on May 18, 2026

feat(react): route element-template background tree via multi-slot
upupming
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test(react): update element-template fixtures for multi-slot output
upupming
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test(react): fix mockNativePapi schema + drop ET internal import assertion
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test(react): cover legacy paths + drop unreachable post-multi-slot branches
upupming
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refactor(react): drop BackgroundElementTemplateSlot legacy path
upupming
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test(react): drop placeholder hack from hydrate fixtures
upupming
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chore: drop public package bump from ET multi-slot changeset
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fix(react): keep ET sibling chain in lock-step with cross-slot append-tail
upupming
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fix(react): clean source slot when ET child moves between slots + tighten contract
upupming
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test(react): restore children.iterates-existing-slots and make it meaningful
upupming
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refactor(react): simplify ET multi-slot $N collection to mirror snapshot path
upupming
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test(react): add Preact-driven cross-slot move test for the removeChild fix
upupming
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