The overview's total_input/output/cache token counts summed only the
sessions counters (main-loop usage), while the per-model breakdown
already included auxiliary usage rows (task dimension from #65537) and
reconciled residuals. Result: hermes insights top-line totals
undercounted aux spend (compression summarizer, vision, titles) and
disagreed with the per-model table below them — the symptom reported
in #58592 and requested in #9979.
When the per-model breakdown is available, derive the overview token
totals from it (same pattern total_cost already used). Verified no
double-count across incremental CLI deltas, gateway absolute
overwrites, and aux rows.
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