Merge Cyd's glass-lamp-latency: #138 unfocused flash-rate fix + red Panic/Eject + plasma no-frame

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

context/glass-cockpit.md

@@ -169,6 +169,19 @@ Verified live: two flagged windows came up caption-less while the other five kep
 still dispatched on the frameless radar (`CLICK 'Secondary / Radar' addr=0x18`), and a
 finished-drag save round-tripped both flags back into the file.
 
+**The plasma window is in the list too (2026-08-04) [T2 round-trip-verified].** The desktop plasma
+display (`L4PLASMAWIN`, title `BattleTech - Plasma`) is created by a DIFFERENT TU than the
+per-display panels, so it can't be a `gWins[]` entry. Instead it registers with a small
+extern-window registry in `L4GLASSWIN` (`BTGlassLayout_RegisterExtern`), and on creation it reads
+its saved rect + `,noframe` via `BTGlassLayout_QueryWindow` (BEFORE sizing — `WS_POPUP`'s frame
+extent differs). `SaveLayout` then writes the plasma's line alongside the panels (with a
+last-known-rect cache so a teardown before the save still preserves its line), and the plasma
+WndProc calls `BTGlassLayout_Save` on `WM_EXITSIZEMOVE`/teardown. So `BattleTech - Plasma=x,y,w,h`
+appears in the cfg like any panel and honours `,noframe`. Verified: a drag wrote
+`BattleTech - Plasma=321,222,…`; a reload with `,noframe` brought it up `WS_POPUP` (no `WS_CAPTION`)
+at 321,222. NB the plasma window blits directly every frame (`GetDC`+`StretchDIBits`), so unlike
+the panels it has no `WM_TIMER` focus-throttle to worry about.
+
 **Verified 2026-07-26 [T2]:** `BT_RIOBANK_LOG=1` dumps every bank's rects;
 `scratchpad/checkbank.py` reports the per-bank census and proves no address is SHADOWED (has a
 point no earlier button covers); `scratchpad/clickbank.py` then posts a real click at every