#161 lost a 36-minute verify-stack job whose only surviving output was a
single ✘ line: the per-spec summary (#136) renders a verdict icon and nothing
else, so a red e2e still costs a log dive — and when the log is truncated or
the run is killed, there is nothing to dive into.
Adds a stdlib assert-based self-check for infra/playwright-summary.py (no
framework) and rides it on `make unit` so CI catches a broken summary.
Fails with "AssertionError: Test timeout of 90000ms exceeded" not in the
rendered markdown.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
