Contract face moves to contract/slots.ts (PropsRuntime composition off the
conversation SlotMap entry, flat answer/cancel injected share); apply takes
the ui-sidebar terminal form (strict need() service reads, ctx.effect-wrapped
single register, framework-resolved sessionId); tests upgrade to the terminal
style (props-direct component specs with standard-kit stubs, real-registry
apply spec with children-declared slot, fiber-teardown case).
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