synthetic-unmapped-keys expectations (manually calculated, synthetic)
Two assistants have an extra usageMetadata key beyond the six fixed categories: serviceTier or anotherUnknown. Import mapped fields. Record unmapped_usage_keys once per file, with the flag persisted in parsing context across scans.
Expectations
- Two events. Summary: call_count=2, input_total_known=300, output_total_known=50, total_tokens_known=350, cache_read_known=None; neither record directly reports cache read. Unknown remains unknown.
- Exactly one unmapped_usage_keys diagnostic.