Torso: the TWIST goes LIVE -- electrical watchdog chain, centered crosshair, coherent controls (task #57/#58)

The MadCat torso twists, the view turns with it, and targeting follows.
Three reconstruction fronts closed:

THE ELECTRICAL WATCHDOG CHAIN (why the torso never powered up):
- PowerWatcher::UpdateWatch reconstructed (@004b181c, the REAL registered
  Performance -- PTR @0050f5fc; Ghidra missed the fn start): the watchdog
  MIRRORS the watched subsystem's electrical level (+0x278), brownout
  downgrade when gen output <= minVoltage% x rated.  @004b1804 relabeled
  ResetToInitialState (slot 10) -- the old "Simulation" tag was wrong.
- The factory watcher-CONNECT pass reconstructed (vtable slot +0x38,
  @004aee2c/@004b1a40 byte-identical, recovered from raw exe bytes):
  watchedLink.Add(roster[watchedSubsystem]) on the master node.  Was the
  SubProxy::Start() no-op -- every watchdog sat at 0 forever.
- MinVoltageScale = 0.01 (a 10-byte x87 literal @0x4b1924; was 1.0f =
  permanent brownout) and PowerWatcher's Derivation chains its REAL base
  HeatWatcher (the HeatableSubsystem stand-in broke IsDerivedFrom for the
  whole Torso/Searchlight/ThermalSight family).
- KB correction swept: derivation tag 0x50e604 = HEATWATCHER (not
  "HeatSink"); the btl4gaug heat-widget gate now tests it via the
  BTIsHeatWatcher bridge.

THE CROSSHAIR (task #58 forensics, 6-agent workflow + live probes):
- The VIEW is TORSO-MOUNTED: jointtorso -> jointeye -> siteeyepoint in
  every twist-capable .SKL; the camera + canopy ride the same hinge
  subtree through HingeRenderable's live matrix-stack compose -- ALREADY
  WORKING in the port.  The crosshair stays screen-centered (center IS
  the boresight); the twist reads on the tape carets/compass/radar.
- The real bug was the port's gBTAimX = tan(twist) slew (the falsified
  "body-mounted view" model): the camera already carried the twist, so
  the crosshair counter-slid to hull-forward and the fire ray with it.
  Deleted; the pick ray inherits the twist from the yawing eye basis.
- Two instrumentation traps documented (chase-eye-as-default-camera,
  BT_FORCE_TORSO clobbering real joints -> the hook now only fills
  unresolved ones); an over-correcting explicit eye compose was added on
  those false readings and retired the same day.

CONTROLS + REPLICATION:
- Q/E spring-center on release (the axis is a twist-RATE demand; the old
  hold-deflection model drifted forever); X also zeroes the axis and
  pulses the authentic torso Recenter (@004b6918).  M cycles control
  mode via the real CycleControlMode body.
- Torso update-record DIRECTION fixed: engine truth is Write=serialize /
  Read=apply; @004b6a78 is the READ (was mislabeled Write) and the
  missing WRITE @004b6a1c recovered from raw disasm (recordLength 0x1C,
  twist/vel/rate at +0x10/14/18) -- kills the replicant's 0xCDCDCDCD
  -140-degree ghost twist.
- Marching-ghost desync: 4 Standing-case guards zero stale reverse
  cycleSpeed (negative cadence passed the <= ZeroSpeed stop gate).
- Kill credit rerouted to the OBSERVED killer (lastInflictingID ->
  killer's player link) -- kills count, target K/D populates.

KB: subsystems.md (watcher chain), multiplayer.md (record direction),
combat-damage.md + gauges-hud.md + cockpit-view.md (torso-mounted view
re-correction), decomp-reference.md (new addresses + tag fix),
open-questions.md (dead capability-roster loops 2-4, snapshot CD read).

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

context/subsystems.md

@@ -55,6 +55,35 @@ Making a base byte-exact GROWS every subclass — they must be re-based TOGETHER
   an untangle. NOT the valve/advanced-damage gate — that's the owning **BTPlayer** @mech+0x190, see
   [[combat-damage]]/[[open-questions]]). [T2]
 
+## The watcher electrical chain (task #57, 2026-07-13 — the torso power gate)
+The Watcher branch is POWERED indirectly: a watcher WATCHES another roster subsystem and mirrors
+its electrical state. The full chain, byte-verified [T1]:
+- **Data:** the model entry `WatchedSubsystem=<name>` → segment index **+2** at resource+0xE4
+  (`HeatWatcher::CreateStreamedSubsystem` @004aec54); the ctor @004aeb40 stores it at
+  watcher+0x128 (`watchedSubsystem`).
+- **Bind (factory post-roster loop 1):** vtable slot 14 (+0x38) — `@004aee2c` (HeatWatcher) /
+  `@004b1a40` (PowerWatcher/Torso override, byte-identical); **Ghidra missed both function
+  starts** (recovered from raw bytes; the vtables.tsv rows have GAPS where the exporter skipped
+  slots — dump the exe bytes at vtable+slot*4 when a slot looks missing). Master-gated
+  (`(owner->simulationFlags & 0xC)==0 && (flags & 0x100)`); binds `watchedLink(+0x114).Add(
+  owner->roster[+0x128][watchedSubsystem])`. Port: `BTWatcherWatchedIndex`/`BTWatcherBindTarget`
+  bridges (heatfamily_reslice.cpp) called from the mech.cpp factory loop.
+- **Tick:** `@004b181c` = the REAL `PowerWatcher` Performance (PTR @0050f5fc → 004b181c) =
+  `UpdateWatch()`: heat mirror (FUN_004aeac4) + `watchdogAlarm.SetLevel(watched->electrical
+  level @+0x278)` + brownout downgrade to 1 when `gen->outputVoltage(+0x1DC) <= minVoltage(+0x180)
+  × gen->ratedVoltage(+0x1D8)`. The Torso sims (@004b5cf0/@004b65f8) call it first-line.
+  (`@004b1804` is slot-10 **ResetToInitialState**, NOT the Simulation — old recon mislabel, fixed.)
+- **MinVoltageScale = 0.01** — a 10-byte x87 literal at 0x4b1924 (`0a d7 a3 70 3d 0a d7 a3 f8 3f`);
+  the port had 1.0f, making minVoltage 100× too big → the brownout latched every watchdog at 1.
+- **PowerWatcher::GetClassDerivations chains HeatWatcher** (real base) — the old HeatableSubsystem
+  stand-in broke `IsDerivedFrom(HeatWatcher)` for Torso/Searchlight/ThermalSight and silently
+  skipped them in the connect pass.
+- **Effect:** `Torso::ElectricalStateLevel()==Ready(4)` un-gates `effectiveTwistRate` — the MadCat
+  torso twists at its authored 50°/s (±140° limits, roster 17 watching 15 → generator @10000V);
+  the BLH is authentically fixed (`horizontalEnabled=0`, limits ±0.01°). [T2 live-verified]
+- **STILL DEAD:** factory loops 2-4 (heatable/weapon/damageable capability rosters) go through the
+  `SubProxy` stub whose `IsDerivedFrom` returns 0 — they add NOTHING. See [[open-questions]].
+
 ## The four systemic checks (every subsystem)
 See [[reconstruction-gotchas]]: (1) shadowing (re-declared engine-base fields), (2) the `Wword` trap,
 (3) message-handler chaining, (4) entity validity. Plus resource-struct layout (must mirror the class