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    "codec": "Effect.runPromise around actual Schema JSON encode/decode; V4 schema verified byte-identical to pinned merge-base; V5 imported from pinned HEAD",
    "scope": "in-memory HOST only; no SQLite/network/device/UI; fixture generation and assertions outside timing; 10000 system_notice items each with 1792-character repeated ASCII payload plus index",
    "dependencyReuse": "existing workspace dependencies; V4 schema/contracts/shared verified unchanged base vs head"
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