the visible limp (#78): there was never a jump-jet clip set -- the 'Airborne' drivers ARE the gimp gait machines

The port had FUN_004a5bf8/71f4 fully reconstructed as AdvanceBody/Leg-
AnimationAirborne, gated on (MovementMode()==3||4) && jumpCapable@0x580 and
believed dead ("the test mech never jumps").  The binary says otherwise:
mech+0x40 in that gate is the graphicAlarm LEVEL (3=left-leg gimp, 4=right)
and +0x580 is hasGimpClips, set by the conditional loader block that probes
'wgl' and fills clip slots 22-27 (wgl/wgr/ggr/ggl/gsl/gsr) plus the four
measurements at 0x53c-0x548 (wg entry strides = speed caps, gg cycle strides).
Renamed the five jump* members + both drivers accordingly.

New: GimpBodyClipFinished @004a6344 / GimpLegClipFinished @004a7970 -- the
gimp transition machines, branched from the normal finished-callbacks.  Phase-
correct limp entry (left-gimp enters 0x16/wgl only from a RIGHT step, right-
gimp 0x17/wgr from a LEFT step), gg cycles at gimp cadence, gs exits, and the
demand clamp to the gimped side's speed cap (leg cb writes it back into the
mapper -- the binary's authentic slowdown; the T3 x0.5 stand-in in mechmppr is
retired, BT_GIMP_SPEED now defaults 1.0).  The binary's gimp machines have no
reverse entry -- the "reverse disabled" behavior is now binary-proven.

Reviving the dead drivers replayed two port-glue bugs (gotcha #24): the raw
*(controlSource) mapper read (null -> crash at first engagement) and the
missing alarm->member state re-sync (machine pinned in one run state).  Both
fixed; bench harness gained BT_SELF_DAMAGE_TICKS=<n> to hold a zone past
LegHalfStructure without destroying it.

Bench-verified (madcat, novice, zone 16): crossing -> alarm 4 -> wgr entry
from a left step -> 8k+ frames stable in the ggl limp cycle at cadence 14.77
(vs 18.5 walk / 22+ run) with raw demand still 50.  [T2]

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

docs/P3_LOCOMOTION.md

@@ -45,7 +45,7 @@ be "called on":
   + `IntegrateMotion`) in `PerformAndWatch`, retiring the Step-1/2 stand-in translation + free-standing
   `gBodyAnim`. Gives the authentic locally-simulated + displayed-motion gait.
 
-**Deferred polish (post-core):** airborne/fall gaits (AdvanceBody/LegAnimationAirborne), torso-twist-to-target
+**Deferred polish (post-core):** ~~airborne/fall gaits (AdvanceBody/LegAnimationAirborne)~~ — RESOLVED 2026-07-30: those were the GIMP (limp) drivers, now `AdvanceBody/LegAnimationGimp`, live for #78 (see context/locomotion.md §visible limp); torso-twist-to-target
 (Torso is FULLY reconstructed — TorsoSimulation twist/elevation @004b5cf0 + WriteJoints; needs wiring), gyro sway.
 
 **First-milestone recommendation:** Steps 1-2 give a visibly correct animation-driven walk/run (real speeds,