synthetic-aux-task-mutex expectations (synthetic)

Same session/model: a main cumulative row, task=‘’, input=100, api=3; and an independent auxiliary row, task=‘background_review’, input=20, api=1. Fixed source shows record_auxiliary_usage writes only the task-key row, excluding it from the main session total. Their six-column composite keys are different; these cumulative values do not overlap.

Manually calculated V03 expectations:

• Two source_aggregates rows, both coverage=exclusive; duplicate_rows=0.
• sum_exclusive_aggregates: input_uncached=100+20=120, never 220 by adding auxiliary into main and counting it again; reported_call_count=3+1=4, exclusive_rows=2, overlap_unknown_rows=0.
• Initialized cache zeros remain unknown; do not fill input_total/total_tokens.
• No usage_events.