Intra-process progress exchange medium#807

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Commits on Jun 12, 2026

Add chain: per-writer forward-linked compacting chains for progress all-reduce

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chain: rework to a single multi-writer chain with in-place head merging

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Add chain_bench: Chain vs MPSC baseline vs per-writer Mesh

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Commits on Jun 14, 2026

chain: lock-free fast path for idle recv

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chain_bench: add ledger and per-reader cells structures, plus allocating-key axis

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chain_bench: results across structures, scenarios, and key types

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