Record the staged design for batch-aware L1 shared-KV prefetch under CP + HiCache. The plan separates L2->L1 load two-layer lookahead from L1 prefetch one-layer lookahead, keeps target first and draft/EAGLE out of the first phase, and calls out that current suffix reuse remains synchronous until the request-aware span contract is extended.
Constraint: Existing CP shared-KV correctness failures came from batch-global remap/req-id ambiguity, so bs>1 prefetch must carry explicit per-request spans and ids.
Rejected: Reuse the bs=1 scalar prefix_pages prefetcher for bs>1 | it aliases request rows and cannot represent mixed prefix/current spans.
Rejected: Make draft/EAGLE prefetch part of the first phase | target path must be validated first before coupling draft lifecycle.
Confidence: medium
Scope-risk: narrow
Directive: Do not open bs>1 L1 prefetch until req-id fail-fast and per-request slot span tests cover both MLA and index paths.
Tested: git diff --cached --check
Not-tested: Runtime implementation; this is a design document only.
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