Write the limitations bullets

Docs that describe the happy path and stop.

Write the limitations section this page is missing: hard limits with numbers, cases that work but perform badly, and anything the feature name implies but does not do. One bullet each, stating what happens rather than what is unsupported. Do not soften it.

Docs or code:

Runbooks and support. What to do at 3am, the failures that keep arriving, and the limits nobody wrote down.