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  "limitations": [
    "Synthetic scale calibration; not a claim about every user knowledge base.",
    "Mutation latency includes snapshot preparation, rollback preimage cloning and durable file persistence.",
    "Heap growth samples do not capture every transient allocation. RSS is a process-wide high-water mark.",
    "Cancellation samples use a cooperative backend. A provider ignoring AbortSignal remains leased until quiescent.",
    "Fuzzy matching retains complete candidate scans; worst-case matching remains quadratic."
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}