fix: ensure derived signals maintain reactions after deps change outside effect context#17262

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Copilot wants to merge 8 commits intomainfrom

copilot/fix-derived-reaction-bug

Commits on Nov 28, 2025

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Add comprehensive tests for derived-proxy-property-deletion scenarios

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Add more tests for derived-proxy edge cases with untrack and nested deriveds

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Add tests that verify reactions are properly maintained

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Add tests for signal proxy replacement scenarios (property present/absent cycling)

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dummdidumm
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Add tests for multiple deriveds interacting and deriveds escaping effect contexts

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Add failing tests that reproduce issue #17263 - derived with SvelteSet reconnection bug

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fix: ensure derived signals maintain reactions after deps change outside effect context

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