I've been running a technical blog for years. Posts accumulate — but so does everything around them: theme edits, editor migrations, hand-written HTML from 2018, mobile layouts nobody re-checked after the last redesign. Everything looked fine. So last week I stopped adding posts and audited all ~200 of them instead, read-only first, then fixed only what the audit actually justified. Three things were broken. None of them were visible on my own screen. The rule I set before to...