Glass input audit: RIO mapper id fix (panel banks live), keyboard reconciliation

Root cause of the dead on-screen panel: MechRIOMapper's message-id enum
chained off L4MechControlsMapper::NextMessageID (=0x19), registering all 18
RIO override handlers at 0x19-0x2a while the streamed .CTL EventMapping
records carry the binary's ids -- the binary RIO table @0051dd30 re-registers
the BASE aux/zoom ids 3..0x13 (Hotbox 0x1a @0051de98).  Every MFD-bank/zoom
press hit the base ConfigureMappableMessageHandler FAIL trap (26/72 buttons
dead; an abort() on a trap-armed pod).  Ids now pinned to the binary
numbering + static_assert-locked (btl4mppr.hpp) -- panel goes 26 -> 52
working buttons (8 await handler reconstruction, filed on Gitea; 12 have no
streamed mapping authored = authentically inert).

Keyboard reconciliation (glass-only): the merged map -- keyboard hosts the
~20 core gameplay actions on the CONTROLS.MAP keys, the panel covers every
pod address by click (right-click = hold latch):
- W/S throttle lever, A/D pedals, Q/E twist, R/F elevation, X all-stop,
  arrows drive; numpad flight cluster kept (Cyd)
- 1/2/3/4/Space/LCTRL/RCTRL fire, LALT reverse, B look-behind (0x41)
- M=0x18 mode cycle, N=0x15 display cycle, H=0x2C coolant flush (hold),
  C=0x2F Condenser1 valve, G=0x0E weapon-1 configure (Mfd1-Quad-gated)
- F5-F9 = Mfd2 bank 0x27-0x24 + 0x22 (page-gated gen A-D / gen mode)
- hardcoded: ` or V = view toggle, J/K/L = Mfd1/2/3 preset-page cycle
  (PadRIO edges -> gBTPresetCycle; no pod "cycle" button exists)
- PadRIO::SuppressKey: bound keys are swallowed from the typed 1995 channel
  (the btinput suppression pattern, glass side) -- ends the glass double
  dispatch ('w'=pilot select 0, 'a'..'g'=MFD2 presets, NUMPAD/F-key key-up
  VK aliases like VK_F5=0x74='t').  Unbound keys keep their authentic
  meanings (5/z presets, t-o pilot select, +/- zoom, F1/F2 align).

DISPLACED from Cyd's default bindings (each reachable on the panel or by a
bindings.txt edit -- flagging for Cyd's veto): number row -> secondary panel
(1-4 now fire), QWERTY row -> pilot keypad (dropped), arrows -> hat looks
(now drive), V/C/B -> fire 0x47/0x46/0x45 (now view/valve/look-behind),
LCTRL -> throttle-down (now fire).  XInput pad section untouched.

Audit by-products (KB updated): the always-active msg-4 records identified
(0x2C = Reservoir flush, 0x29-0x2F = condenser valves, 0x1A-0x1D =
GeneratorA-D ToggleGeneratorOnOff @004b1ed0 unreconstructed); 0x13 = Mech
DuckRequest (crouch), 0x28 = BalanceCoolant; Searchlight/ThermalSight
ToggleLamp handler-sets are default-constructed EMPTY; weapon Eng-page msgs
0x3/0xb = ToggleCooling / ToggleSeekVoltage / EjectAmmo, all unwired;
unhandled messages are SILENT (no [FAIL] -- census = BT_CTRLMAP_LOG dump x
handler tables).

Verified live (build-glass2, ARENA1): panel presets/zoom/display/flush;
W drive (speedDemand 61.5, gait advances), Q turn (BAS), M -> MID, A turn
(MID), Space fires, N display, J/K/L presets, H flush drain, C valve 1->5;
suppression ('w' swallowed, 't' flows, F5-keyup swallowed); BT_SHOT frame.
Un-regression: pod build (gates OFF) compiles 0 errors, forced-walk drives,
streamed ids unchanged; CONTROLS.MAP/btinput untouched.

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

context/decomp-reference.md

@@ -239,6 +239,29 @@ From the weapon `.SUB` records + the charge-curve `.data` constants (PE-parsed a
 - MechWeapon handler table @0x511860: {9,"ConfigureMappables"→@004b9550}, {10,"ChooseButton"→@004b95b8}
   (strings @0x511994/@0x5119A7).  PoweredSubsystem table @0x50F4EC: ids 4-8 = SelectGeneratorA-D /
   ToggleGeneratorMode → @004b099c/@004b09e4/@004b0a2c/@004b0a74/@004b0abc.
+
+### Binary message tables decoded 2026-07-20 (glass input audit) [T1]
+16-byte HandlerEntry {id, namePtr, fnPtr, 0} rows in section_dump. Per-receiver-class id spaces.
+- **Mech (entity)** @0x50BDF8..: 0x12 TakeDamage@004a0230, 0x14 PlayerLink@0049f624, 0x15
+  RealMaxSpeed@0049f604, **0x16 BalanceCoolant@0049f728**, 0x17 SetBurningState@0049f674, 0x18
+  ClearBurningState@0049f700, **0x19 EjectPilot@0049f854**, **0x1a DuckRequest@0049fa00** (the
+  manual's CROUCH; streamed button 0x13 sends it — unreconstructed).
+- **HeatableSubsystem** @0x50E41C: {3, "ToggleCooling"→@004ad6f8} (the Eng-page msg-3 button on
+  every weapon/avionics — unwired in the reconstruction).
+- **Generator** @0x50FB90: {4, "ToggleGeneratorOnOff"→@004b1ed0} (streamed buttons 0x1A-0x1D →
+  GeneratorA-D — unreconstructed).
+- **Searchlight** @0x51120C: {3, "ToggleLamp"→@004b860c}; PowerWatcher/ThermalSight-side variant
+  @0x51117C: {3, "ToggleLamp"→@004b838c}.  (Reconstruction has Searchlight::ToggleLamp but the
+  MessageHandlers set is default-constructed EMPTY — unwired.)
+- **Myomers-class** @0x51158C: {9, "ToggleSeekVoltage"→@004b8a48}; **energy-weapon** variant
+  @0x511DB8: {0xb, "ToggleSeekVoltage"→@004ba478}; **ammo-weapon** @0x512210: {0xb,
+  "EjectAmmo"→@004bb9b8}.
+- **MechRIOMapper** @0x51DD30: RE-REGISTERS the base ids 3..0x13 (Aux1Quad..ZoomOut) with the
+  RIO override handlers @004d22fc..@004d24f8, + {0x19, Keypress→@004d2514} (RIO's OWN keypress,
+  unreconstructed — we use the shared L4 0x17 @004d1bf0) + {0x1a, Hotbox→@004d2574} @0x51DE98.
+  The reconstruction's enum chained these ids to 0x19-0x2a until 2026-07-20 — every streamed
+  MFD-bank/zoom press hit the base FAIL trap; now pinned + static_assert-locked (btl4mppr.hpp).
+- Unhandled ids are SILENT: `Receiver::Receive` Find() returns NullHandler and does nothing.
 - MechWeapon ATTRIBUTE table @0x511890: ELEVEN entries — 0x12 PercentDone@0x320, 0x13 TriggerState@0x31C,
   0x14 DistanceToTarget@0x324, 0x15 TargetWithinRange@0x34C, 0x16 WeaponRange@0x328, 0x17 PipPosition,
   0x18 PipColor, 0x19 PipExtendedRange, 0x1A EstimatedReadyTime@0x330, 0x1B RearFiring@0x334,