[Modular]improve loop block#14159

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refactor-iterative-loop-blocks

Commits on Jul 10, 2026

Add IterativePipelineBlocks: composable loop blocks with loop-local state scopes

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Pass loop variables as call arguments instead of state scopes

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Enforce uniform loop-variable signatures for all loop sub-blocks

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Document nested-loop __call__ signature on IterativePipelineBlocks

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Add ModularLoopPipelineBlocks base and __call__ contracts

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Drop loop_* declaration properties; validate sub-blocks at construction

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