Summary

• add real httpx bug-fix, add-feature, and refactor benchmark tasks
• ground each new task in a merged upstream PR
• use existing output_contains, file_modified, tests_pass, and function_added criteria

Sources

• bug-fix: Handle empty zstd responses encode/httpx#3412
• add-feature: made dependencies on certifi and httpcore only load when required encode/httpx#3377
• refactor: Move normalize header functions from _utils.py to _models.py encode/httpx#3382

Verification

• go run ./cmd/cogni bench --list --tasks internal/bench/tasks.yaml
• go test ./...
• go vet ./...
• git diff --check