"""INDEPENDENT VERIFIER — Layer 12 (spec 18).

This package re-implements parsing, aggregation and canonical serialization
from the specification tables with its own code paths (regex-based line
splitter, table-based civil-days math, distinct decimal parser, distinct
aggregator). It never imports producer parsing/aggregation/serialization
functions. The only shared module is engine/versions (allowed by spec 18.1).
"""