docs: events in the dock and on its page

The dock's Events block, the events slide-over page, the availability-rule deviation, the probe lines and the removal of the left pane are described; the false remembered-width claim is gone.

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

docs/claude/invariants-plot-and-layout.md

@@ -40,6 +40,14 @@ Part of [CLAUDE.md](../../CLAUDE.md). These are rules that cost a defect to lear
   moved the plot column by about 180 px, which the layout probe read as a different `done_box` and a
   taller figure.
 
+- **Events never take the plot's width.** The events list is a slide-over page (an overlay child over the plot) and
+  the dock's Events block lives in the fixed 280 px column, so there is no events divider, revealer or pane beside the
+  plot to squeeze it; the first latch must not move the plot area (`[events] ... plot_w_stable=1`, which compares the
+  allocated width before and after). A dock row is a fixed-width ellipsized label (title at 18 characters, `#seq`), the
+  list is a fixed 112 px scroller capped at `kDockEventsMax` rows plus one "N more" row, and it has no thumbnails: the
+  dock's width and height do not depend on how many events there are or what they say ("layout must not depend on
+  content"). The thumbnails are the *page's* (138 px wide).
+
 - **`plot::Plot` cannot remove or retarget a trace.** Hence fixed trace slots created
   up front and rebinding via `SlotSeries`; a *name* change (legend text) is the one
   thing that forces a rebuild. Cursors are parked outside the axis range instead of
@@ -131,7 +139,7 @@ Part of [CLAUDE.md](../../CLAUDE.md). These are rules that cost a defect to lear
   the Source badge is on screen for the E-1608 and hidden for UDPS, and its text differs by kind). A change that makes it grow with the signal count has
   taken the scroller out of the measurement.
 - **The dock's width is fixed too, and it is the readouts' width that holds it there** (`side_column`
-  `width-request` 260, the split view's 280 px floor and cap). The dock holds only the compact readouts, so a
+  `width-request` 260, the split view's 280 px floor and cap). The dock holds only the compact readouts and the Events block (a fixed-height list, below), so a
   section's visibility is never what makes it taller; the scroller absorbs the rest. **The readouts' minimum
   width is the sum of their cells' character widths, and it must stay under 280** (the Readouts box is 268:
   280 less its 6 px margins): a cursor line is the `who` cell (5 characters) plus three value cells (9 each),
@@ -139,7 +147,7 @@ Part of [CLAUDE.md](../../CLAUDE.md). These are rules that cost a defect to lear
   tooltip carries the text and the layout never depends on what a value reads. The `who` cell was 8
   characters, which made the readouts' minimum width 304 px; that pushed the sidebar to 304 px
   (`dock_w=304`) and defeated the 280 pin. Widening any cell is the same
-  trap -- read `[readouts] ... dock_w=` (must be 280) and the `dock cursors:` / `dock measures:` `fits=`.
+  trap -- read `[readouts] ... dock_w=` (must be 280) and the `dock cursors:` / `dock measures:` `fits=`, and for the Events block `dock events: ... dock_w=` (268).
 - **Trace slots are identified by signal name, not channel index.** Enabling a signal
   or a new CONFIG renumbers the channel list, so an index would silently re-point a
   trace at another signal.