tests-verify-via-output-headers

IN premise — entries/2026/04/24/tests-test_derive_budget.md

Test methodology detail (how assertions parse output), not a codebase architectural invariant

Summary

Tests in this system verify behavior by checking HTTP response headers in the output rather than inspecting internal state directly. This is a detail about how the test suite is structured — it describes the assertion mechanism used, not a fundamental design constraint of the codebase itself.