CROUCH reconstruction (WIP): the master posture/duck machine, decoded + wired

Raw-disasm of the dark master-perf region (@0x4a9cf0-0x4aa0af): the myomer
effectiveness factor (+0x79c, MAX over heatables' +0x31c, scales speedDemand
-- feeder @004b8be3 unreconstructed, neutral 1.0 [T3]), the posture selector
(+0x3f8: mode/novice/leg-state/myomer gates -- novices cannot crouch), and
the DuckRequest consumer (standing -> SetLegAnimation(2) 'sqd', ducked ->
SetLegAnimation(3) 'squ', ForceUpdate 8+1 ships the type-3 state record,
stability alarm flips, request consumed).  +0x1DC = mountSegment... er, the
searchlight learned that one; here: mapPosture @0x3f8 + myomerEffectiveness
@0x79c members land; value-space note (port normal mode == 1, binary 0).

VERIFIED: request->consumer chain fires ([duck] SQUAT), the sqd clip plays
(22kf/7joint, ends root -2.22 crouched -- clip data parsed from BTL4.RES,
squ is its exact mirror; loader slot map re-verified byte-exact).  OPEN: the
parked crouch pose does not HOLD on screen (reverts ~1 frame after clip end
with NO SetLegAnimation re-arm logged) -- the hold's render path is the
remaining dig; [duck] re-arm tracer left in SetLegAnimation.

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

game/reconstructed/mech2.cpp

@@ -220,6 +220,16 @@ enum MechAnimationState
 void
 	Mech::SetLegAnimation(int state)
 {
+	// DIAG (BT_DUCK_LOG): every leg re-arm with the caller's return address --
+	// the crouch-clobber hunt (who re-arms after the squat parks?).
+	if (getenv("BT_DUCK_LOG"))
+	{
+		char dbuf[96];
+		sprintf(dbuf, "[duck] SetLegAnimation(%d) ra=btl4+0x%lx", state,
+			(unsigned long)_ReturnAddress()
+				- (unsigned long)GetModuleHandleA(0));
+		DEBUG_STREAM << dbuf << std::endl << std::flush;
+	}
 	legAnimation.SelectSequence(					// FUN_004277a8(this+0x65c, ...)
 		animationClips[state],						// *(this+0x5cc + state*4)
 		// The real leg finished-callback PTR_LAB_0050d6f0 == FUN_004a6928