Phase 3.0 (L3 disk durable floor) foundational primitives, pure + unit-tested:
- 64B self-describing blob header (magic/version/payload-kind/content-hash/CRC),
verified on every read (verify_blob) -> torn/bit-rot slots become a MISS, not garbage.
- slot_bytes_for_page: header+payload rounded to the 4K O_DIRECT boundary.
- CpL3SlotPool: O(1) free-list over fixed-size per-payload disk page-slots (the L3
analog of CpSharedL2PageAllocator's free list), fail-loud on double-free/OOB, with
reset() for the flush_cache hook. NOT a ring buffer (eviction frees arbitrary slots).
Rank-local (a rank stores only its owned pages; L3 eviction selection rides the shared
LMDB replicated clock). 12/12 unit tests. Design: docs_internal/cp_hicache_l3_phase3_impl_design.md.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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