Records what #61 still needs after #67 delivered two of its four asks, and the two constraints that shape the rest: backend route logic is covered only by the integration suite, which is manual-only because of a post-run hang, and the frontend has no unit tests at all so its coverage has to come from instrumenting the app and collecting from Playwright.
Also records the thing most likely to mislead later — end-to-end coverage marks a line covered when the browser merely ran it, so the frontend number will read considerably better than the testing behind it, and the 80% gate will be easier to clear on frontend changes than backend ones. Accepted deliberately, because the alternative leaves every frontend pull request failing a gate it cannot satisfy.
Refs #61
bermudalamb
7e4084a65f