MP live-play wave: collision economy, missiles, radar transform, panel polarity, comm ticker

The interactive 2-node playtest wave -- every fix decomp-grounded and live-verified:

COLLISION ECONOMY (the ram one-shot): StaticBounce mutates worldLinearVelocity
per contact and ProcessCollisionList walks EVERY touched solid per frame; with
2007 terrain-as-solids the reflections compounded x4-x40 within one frame and a
walking bump one-shot a pristine mech for 112,375 pts (62-pt authentic economy).
Fix: frameEntryWorldVelocity restore per contact (damage always priced at the
real approach speed -- all the binary's physics ever saw); Mech::Reset zeroes
the mover motion (respawn = teleport); [collide-tx]/[mp-hdlr] telemetry.
Gotcha #16 (engine-facility drift class).

MISSILES: peer-visible salvos (the launcher record extension carries a salvo
counter + aim point; ForceUpdate actually enqueues it -- the dirty flag alone
never serialized), the authentic arc (authored MuzzleVelocity vector + the
Seeker's 200m/0.1/300 loft + gain-4 steering, decoded from @004beae4/@004bef78),
world-impact bursts (rounds detonate on cave geometry instead of phasing
through), contact-only damage (flight-cap expiry = fizzle, no more teleport
damage), live re-lead, and ballistic (unguided) shells for autocannons.
projweap's stale BTPushProjectile extern (the /FORCE signature trap, gotcha #6
corollary) crashed the Avatar's first AFC100 shot -- fixed + sweep rule recorded.

RADAR: two transcription bugs made the scope permanently empty -- FUN_0040b244
is the affine INVERSE (not a copy) and FUN_0040adec writes ONLY the 3x3 rotation
(never the translation); worldToView now Invert(view) built rotation-first.
CulturalIcons sorted out of the moving grid (the phantom red pips were map
props), visible-radius culls on all three draw passes, live pip verified at
|delta| x ppm px.  Gotcha #17 (verify the FUN_ body, not its call shape).

WEAPON PANELS (the frozen-dial hunt): the binary's *(subsystem+0x40) means
FAILED -- the recon's 'operating' name was backwards, inverting the destroyed-X
lamps, the panel look, the children enable and the ready-lamp gate (which had
NEVER executed).  Polarity chain corrected end-to-end (failedState, fed by real
damage saturation).  Root cause of the freezes: MFD page-mode gating -- the dev
composite shows ALL pages at once, so off-page dials legitimately stopped; under
BT_DEV_GAUGES the 15 page-plane bits stay active (the exclusive secondary trio
untouched).  The SEH gauge guard now names its kills; repaint-heal resets the
incremental arc after panel repaints; [panel]/[arc] probes added.

COMM/SCORE: MessageBoard LIVE (the engine already shipped the whole
Player__StatusMessage queue; wired the binary's one producer -- the kill branch,
victim's name, 6s -- plus the consumer bridge and a lazy source bind); MP DEATHS
counted via the observed-death tally (each node scores every pilot from locally
observed events, the same model as the KILLS credit) and the -2/-1 engine seed
clamped for display.

DEV UX: node-tagged window titles (-net port), gauge panel reworked (1320x480,
true 4:3 MFD cells, the portrait secondary UNROTATED upright, linear filtering,
BT_GAUGE_SCALE), fixed close spawns via BT_SPAWN_XZ, Boreas flies an Avatar
(first second-chassis live outing).

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

context/open-questions.md

@@ -92,10 +92,17 @@ authentic path scoped.
   chain** ([0x31c]/[0x320] dpl objects + the PNAME1-8.bgf player-name meshes over the locked
   target — matters for MP). (c) the compass rotation SIGN is derived-not-verified [T3] (turn
   left → the stem should swing right; flip the sin sign in Draw if footage disagrees).
-- **StatusMessagePool (NULL stub, btstubs.cpp:62)** — the per-player status-message queue.
-  BTPlayer+0x1dc is never populated → MessageBoard is empty (authentic for bring-up). What
-  resolves it: wire the pool + decode `AddStatusMessage @0042e580` + the `Player__StatusMessage`
-  record ({messageId@+0xc, nameEntity@+0x10}).
+- **✅ StatusMessagePool / MessageBoard — LIVE (2026-07-12) [T1/T2].** Decoded: FUN_0042e580 =
+  the engine `Player::AddStatusMessage` (chain add at +0x1e4); FUN_0042e5a0 = `StatusMessageUpdate`
+  (+0x1dc = the displayed message; +0x14 displayTime countdown, expiry-deleted) — ALL already in
+  the engine [T0 PLAYER.cpp]. The ONE binary producer = BTPlayer::ScoreMessageHandler's KILL
+  branch (@004c02e4 type-2): pool-alloc @00512f6c + ctor(victim's player, strip 0, 6.0s) +
+  AddStatusMessage. Port: engine `new Player__StatusMessage` + Register_Object (the engine
+  reclaims with delete — the binary pool is an allocation detail); consumer =
+  BTResolveMessageBoard reads the mission player's statusMessagePointer + resolves the name via
+  Mission::GetSmallNameBitmap; the board's SetSource binder (no recovered caller) is replaced by
+  a lazy viewpoint-entity bind in Execute. Ticker pops on BOTH nodes (each node's death
+  transition posts its local KillScore).
 - **Gyroscope (0xBC4) — RE-ENABLED LIVE (task #56, 2026-07-10).** The NaN revert's root causes
   are fixed byte-exact (ctor field map @004b3778 — springConstant@0x1E8/dampingConstant@0x1F4
   were mislabelled, the 0x254-0x2B3 block was missing, clamps/accumulators uninitialised; the
@@ -292,6 +299,14 @@ authentic path scoped.
   under reconstruction: config-mode regrouping (task #6), generator reassignment (ids 4-8),
   coolant valves.
 
+- **Subsystem-panel online/offline gate — fields unidentified [T4] (2026-07-12).** The binary's
+  SubsystemCluster draw-state reads `*(subsystem+0x40)==1` and `*(subsystem+0x278)!=4`; neither
+  1995 field is identified (weapon simulationState is 0/2/3/4 -- +0x40 isn't it).  The port pins
+  the panel ONLINE (GetDrawState()==1) because the old raw reads were layout NOISE that flapped
+  the state and black-filled the panel over the recharge arc (the frozen-PPC-dial bug; the
+  WeaponCluster repaint-heal also landed).  Identify both fields to restore the authentic
+  destroyed-subsystem dark-panel look.
+
 ## Locomotion / combat polish (non-gating)
 - Authentic per-mech TURN-RATE constant (currently a bring-up constant rate).
 - Body-callback gimp handlers (states 16-19, targets 0x70b2/0x7161 undecoded → fall back to stand);