docs: the trigger is not persisted, so the condition is not either

The spec described the new condition fields as appended session keys. LayoutState
carries no trigger field at all -- the trigger is built from --holdoff and the
panel's defaults on every launch -- so there was nothing to append to. Persisting it
is a separate feature nobody asked for, and a session that silently restored an armed
pulse-width condition would surprise rather than help. The statistics toggle stays as
the one session key this design adds.

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

docs/superpowers/specs/2026-10-07-scope-features-design.md

@@ -78,7 +78,7 @@ These bind every task below and are not restated in each one.
 | `src/measure.hpp` / `.cpp` | `MeasureStatsAccum` (Welford) beside the existing result types. |
 | `src/plot_host.hpp` / `.cpp` | `kSearchMarks` cursors per row, created in `install()`, placed by a new `set_search_marks()`. |
 | `src/ui.cpp` | The trigger panel's type and parameter rows, the `Search` expander, the statistics toggle and second line, the chunk pump in the frame tick, and the four probes. |
-| `src/session.cpp` | The new `TriggerConfig` fields and the statistics toggle. |
+| `src/layout_store.hpp` / `.cpp` | One new `LayoutState` field: the statistics toggle. The trigger is not persisted today and is not persisted by this design. |
 | `tools/mock_udpstreamer.py` | `--glitch-at` / `--glitch-width` / `--quiet-at`. |
 | `README.md`, `docs/claude/*` | What was built, and the invariants it adds. |
 
@@ -186,11 +186,16 @@ No plot instrument is added. The trigger level has never been drawn on the plot
 button (`src/ui.cpp:135`, `:1604`) — so a band needs no second ruler.
 
 `TriggerConfig` gains one `EventCondition` member; its `level` and `edge` replace the
-`TriggerConfig` fields of those names, and every reader moves with them. The session file gains
+`TriggerConfig` fields of those names, and every reader moves with them.
-the new keys **appended**, since the order is load-bearing
+
-(`docs/claude/invariants-session-and-export.md`); a file without them loads as
+**The condition is not persisted, because the trigger is not persisted.** `LayoutState`
-`TriggerType::Edge` with the level, edge, hold-off, pre-% and mode it already carries, which is
+(`src/layout_store.hpp:19-63`) carries the window, rows, calibration, colours, enabled signals,
-exactly today's behaviour. No version bump, no migration.
+the source, the math graphs and the measurements — and no trigger field at all; the trigger is
+built from `--holdoff` and the panel's own defaults on every launch. Adding persistence for it
+is a separate feature nobody asked for, and a session that silently restored an armed
+pulse-width condition would be a surprise rather than a convenience. The only session key this
+design adds is the measurements pane's **statistics toggle**, which belongs beside the
+`measures` it governs.
 
 The level's existing default — the middle of the signal's declared range until the user edits it
 (`src/ui.cpp:2016-2054`) — applies to `Window` as a band about that middle, and `level2`
@@ -423,7 +428,7 @@ instant. Both are permanent regression cases, like `--time-glitch-at`.
 ## Risks
 
 - **`TriggerConfig`'s `level`/`edge` move into `EventCondition`**, so every reader changes —
-  the panel, the session, the probes and the status line. Mechanical, but wide, and the
+  the panel, the probes and the status line. Mechanical, but wide, and the
   mitigation is that `Edge` behaviour must be bit-identical afterwards: the existing trigger
   probes are the regression test and are run before anything new is added.
 - **The scan's worst chunk is a latency the producer pays.** The chunk size is the one knob, it