Keep the pilot in the seat

[beleata]

Sitting in a pilot seat and turning the ship leaves the avatar's body floating free of the chair
while the view stays where it should. Two causes, both client side, eighteen lines in MyPlayer.cs.

The seat lock is never engaged

MyCharacterController.LockPlayerToPoint already does this job — it parents the player to a point
and eases them onto it, and Update drives it every frame while _isLockedToPoint. Nothing ever
switched it on. Logged once per movement message while sitting in the pilot seat:

lockedToPoint False   attachPoint none   trigger PilotingTrigger   sameObject True

So nothing held the body. Measured against the ship over ten seconds of turning, it drifted about
one metre and six degrees out of the chair, and eventually left the room trigger — at which point
TransitionTriggerHelper called ExitVessel and the client wrapped the seated player in a Pivot.
That is where the "ejected from the ship while piloting" behaviour comes from; ExitVessel fired
four times in one session while LockedToTrigger was PilotingTrigger.

It is engaged only for SceneTriggerShipControl. LockedToTrigger is set for every interactable,
and locking to all of them drags the player into displays, through hulls, and sometimes into lethal
geometry — found the hard way. Anything else releases the lock and unparents, because
LockPlayerToPoint(false) clears its own flag but leaves the parent it set, so a player who stands up
otherwise stays welded to the chair.

A strapped-in player is ragdolled

MyCharacterController ragdolls when Vector3.Angle(transform.up, -GravityDirection) > 40. Turning
the ship turns the room's gravity, while a seated player's up does not follow, so the game concludes
they have fallen over. Logged while seated:

ragdoll True   headParent Neck   bodyToHead 1.966   bodyToHips 2.455   headToHips 0.635

and the skeleton stretched as it went — head to hips grew from 0.63 m to 1.08 m. ToggleRagdoll
now refuses to enable while LockedToTrigger != null; disabling still passes, so a player who sits
down already ragdolled is cleared normally.

Verified

Played against a local server and Nakama, on a clean world. Sitting, turning the ship hard and at
length, standing up, sitting again: the body stays in the chair, lockedToPoint True with the
attach point set, ragdoll False, and the skeleton distances hold to the millimetre. Displays and
panels behave as before.

Ship controls themselves are still wrong — the ship jumps about once a second while steering and
freezes if the input is pushed harder. Not touched here; that looks server side and is next.

Five other explanations were tried and killed by measurement before this one: the movement smoothing
constants, the anchor being allowed to rotate, the rotation being sent in the wrong frame, a detached
geometry root, and the model separating from the body. The skeleton is welded to the transform in
every sample (modelRotVsBody (0,0,0)), so nothing comes apart inside the avatar — seeing your own
body without a head is just the first-person head mesh being hidden from your own camera.