Loading (9→12):
- Add CompletionAwareLoading: skip near-completion request blocks
- Add CostBenefitLoading: ROI-based load-vs-recompute decision
- Add HybridLoading: 5-dim weighted scoring (cost/pressure/sharing/phase/tier)

Prefetch (9→12):
- Add CompletionAwarePrefetch: skip near-completion request blocks
- Add LookaheadPrefetch: chunk-hash chain-based child block prediction
- Add HybridPrefetch: 5-dim weighted scoring (priority/recency/sharing/phase/cost)

Cross-policy coordination (third round):
- Engine computes shared eviction/load pressure signals
- Formal coordination APIs: get_eviction_pressure, get_load_rate,
  get_prefetch_pressure, set_eviction_pressure, set_prefetch_state
- Bi-directional: loading↔prefetch, loading↔eviction, prefetch↔eviction
- Fix 7 bugs: inverted s_shared, hardcoded BW, dead on_access, etc.

Progress docs: 014 updated (4 rounds), 015 created (prefetch 12 strategies)
README:...