docs: a pause publish costs no packets, and the look is checked with frame path

An A/B of the same fast-mock run with and without a pause reads gaps=0 both
ways, the paused one having published in 86 ms -- so the gaps=73 recorded
yesterday as "a pause costs packet gaps, unexplained" was incidental load on
one run. It never scaled with the publish length and has not reproduced.

Record the publish figures as the range they actually span across runs
(event 69-115 ms, pause 22-86 ms) rather than as single readings, and name
`frame path:` across a pause as the check that the paused trace is drawn like
a live one -- raw=1 lod=555 against raw=0 lod=373, where the defect read
raw=21 lod=118.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/model.cpp

@@ -565,8 +565,8 @@ void ScopeModel::publish_pause_view(double lo_s, double hi_s, double x_offset) {
     // It is not free, and the trade is one-off against per-frame: building it took the pause
     // publish from 6.15 ms to 22.31 ms (`publish cost:`), which blocks the *producer* -- against
     // ~5 ms a frame of draw for as long as the pause lasts, which at ~60 fps a 1.6 s pause repays
-    // thirty times over. The gaps a pause costs are **not** this: they measured 79 without the
-    // pyramid and 73 with, so they are the pause's own and still unexplained.
+    // thirty times over. The producer absorbs the stall: `gaps=0` with and without a pause, the
+    // paused run having published in 86 ms.
     auto& pyr = snap->pyramids[c];
     pyr.reserve(take);
     for (f32 v : vals) {