What lives here

Solved debugging cases from this site — symptom, root cause, fix, and how each is covered against regression:

1. Top menu disappeared — a clever class lookup defeated its own documented usage.
2. Live page truncated to 30 bytes — symlink resolved on deploy, double declaration on hosting.
3. Cannot redeclare get_urls() — one function name in two engine trees, only a guard dedupes it.
4. Wrong method dialect — snake_case call on a camelCase engine kills the page before the footer.