_maybe_init_cp_l3: build the 3 CpSharedL2SlabAccessor (target_kv always; draft_kv if draft pool;
index_k if NSA) from the LIVE host pool slabs (verified attrs: host.allocator.mapping.mmap,
layer_num/page_num/kv_cache_dim/dtype.itemsize; index_host_tensor_allocator + indexer attrs), then
CpL3Store.from_config + connect (PLP gate). Single-slab only (default --cp-shared-l2-slab-size-gb 0);
fail loud on the multi-slab group case (future extension, not a silent stub).
_drain_l3_control_queues: per-tick CP-cpu-group MIN over the 2 ack-qsizes + drain MIN of each, idle
early-return on the replicated has_inflight (R1 CRIT-3/4) — wired in check_hicache_events (gated on
enable_cp_l3, NOT the enable_storage drain). reset() -> cp_l3_store.clear(); shutdown() -> close().
Default-off + behavior-neutral. Compiles. 3.0 CODE complete; flag-on smoke gated on cluster branch sync.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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