feat(audit): implement Phase 7 cross-audit integration + Phase 8.1 DSL arity
Phase 7: read_input_json (stdlib I/O boundary), INPUT_JSON_CONTRACTS
(6 input sources), find_enclosing_function (3-tier mapping tier 1),
compute_result_coverage (cross-check of doeh), compute_type_alias_coverage
(cross-check of dss), aggregate_cross_audit_findings (per-aggregate
bucketing), run_all_cross_audit_reads (convenience).
Phase 8 Task 8.1: DSL_WORD_ARITY_V2 (14 new tagged words).
15 new unit tests passing. 111 total tests passing.
Phase 8 Tasks 8.2-8.5 (4 renderers + parser) next.
ed
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