v1.51.2: the v1.51.1 review (HP-1511-01, HP-1511-02)

- HP-1511-01: defaultPositions ran over different rosters — the full card
  reserves grid cells for hidden devices, the static card compacted them
  away, so an undragged marker sat in different spots on the two cards. The
  static card feeds spaceDevs (hidden included) to the shared grid and
  renders devs (visible) — exactly the split HP-1510-01 introduced for LQI.
- HP-1511-02: a hidden ripple-display marker rendered as an icon-less
  inactive pulse. A ghost drops the display dressing entirely: ripple
  presentation off, noicon off, base icon on, whatever marker.display says.

smoke_hidden_flag: the weak 'has icon OR noicon' assertion is gone — every
ghost must carry a base icon; new autoGridParity vector (vb-coordinate
comparison, the cards render in different view systems) and a ripple-ghost
vector. The demo stub got a connection.subscribeEvents so the static card's
module-level config cache can be invalidated between in-test cards.

docs/TESTING.md

@@ -244,6 +244,11 @@ Run the *core flows* (marked ★ below) in each environment at least once per mi
       at 70% of a device icon and zooming WITH the plan; the small metric rows
       under the room name now show in the plan editor too
       [auto: smoke_room_cards gearDetached/plainInPlan]
+- [ ] Auto-grid parity (v1.51.2, HP-1511-01): with an empty layout, a visible
+      device among hidden ones sits at the same spot on both cards
+      [auto: smoke_hidden_flag autoGridParity]
+- [ ] Ripple ghost (v1.51.2, HP-1511-02): a hidden ripple-display marker shows
+      its base icon, no pulse [auto: smoke_hidden_flag rippleGhost*]
 - [ ] Hidden LQI parity (v1.51.1, HP-1510-01): a room whose only Zigbee
       devices are hidden paints the same lqi fill on the full and the static
       card [auto: smoke_hidden_flag lqiParity]