The test that didn't know about hidden posts — when E2E drifted from the production filter
The LifeLog E2E suite started failing with 'Expected "" Received "estudos"' on 24 assertions. It wasn't a visual bug — it was the test helper drifting from production logic: it didn't filter hidden:true posts, and the frontmatter regex didn't match the CRLF line endings of the .mdx files. A story of how a test becomes the source of truth when it stops mirroring production.