When --enable-cp-shared-physical-l2-hicache is on, the lane-stats occ/used_tokens
read 0 (they derive from _cp_counts, which the accounting skips for shared-L2
metadata) -- the per-rank gauge is meaningless. Repoint occ/used/cap at the
shared pool's per-payload-slab fill (target_kv/draft_kv/index_k) via the new
CpSharedL2PageAllocator.occupancy_by_payload(); add occ_by={payload,rank} +
occ_labels so the line is self-describing. The real cp_size (owner round-robin
period for the hot-prefix skew) is now computed independently of the occ-vector
length. Per-rank (flag-off) path unchanged. Read-only; rank-0; next-restart.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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