max / quasi

Describe a chart, and fix the loop window that hid a guard A chart is `Node::Chart { axis, bars }`: the bars are the run a request varies the length of and the axis is one fact beside it, which is a loop and a hole outside it. Drawn by all three renderers through a makeover widget each, the way a meter already is. `Tag::latched` takes no argument now, and a condition is written as a guard. A `bool` has no stand-in and a loop body cannot carry "exactly one of these differs" as a value -- the Select's problem, with the Select's answer. It joins `chosen`, `figure` and `bar` in `PLACED`: what it varies is a class inside the tag its own statement produces, so turning it off deletes bytes. Breaking; every call site in the tree moves with it. `grown` converted both ends of its window by subtracting a body length. `wide` is `P F F Q` and the removable copy sits anywhere from `|P|` to `|P| + |F|`; the latest of those is one copy after the body's own place, but the earliest already IS that place and does not move. Subtracting from both underflowed -- fixed in 0.108 by answering `at`, which left a window one point wide, and that is the second failure: `placed` then has nowhere to slide to. Which matters because the prefix scan can run past the body. `</div>` and `<div class="figure"` share their `<`, so the converted `at` lands a byte inside an opening tag, and with no window the loop sat off its own body and overlapped a guard inside it. `build` refused the screen as a structure that is not a tree. Every loop already on the seam happened to have an unguarded body, which is why nothing had hit it. `quasi-bench`: `charted` proves the member derives, replays and fills byte for byte across every shape the data takes; `guarded` is the regression test for the window, on a shape as ordinary as a strip of figures where each may report a change.