WIP: plan chunked prefill scheduling - #178
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Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
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Description
Plan-only design for bounded chunked prefill with decode-first scheduling and transactional rollback.
Motivation
Whole-prompt prefill admission can stall active decode rows and inflate tail latency.
Scope
Dependencies / limitations
Uses canonical optional PrefixLeaseProvider and LayeredPagedKVStore contracts. Reconcile with prefix-reuse implementation before co-enablement. No P/D disaggregation.
Type of Change
Performance / support evidence
Checklist