[CultElementId] marks a string member; the registry refuses a document type
whose list element type (union bases included) lacks one, naming the type and
member. A write mints a random 12-hex id for each unset id and refuses a
duplicate within one list. A store written before ids loads with ids minted in
memory from SHA-256(record key, element path), so every reader and every reload
agrees; they persist on the store's first write. CultCache.MintElementIds()
rewrites the records whose ids exist only in memory.
CultLib's own list-element types gain an id (Geometry, Mesh body, discovery,
entity prefab). CultMeshCdnChunkRef and the CultWitness* elements are pinned by
cross-runtime vectors and are left alone; see the C2a report.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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