40250 parity: CPythonPlayer::NEW_MoveToDirection's m_isCmrRot branch
continuously rolls the camera toward the held movement direction every
frame while a direction key is down, independent of whether a new
translation target was just set. Add _camera_auto_rotate() to replicate
this (forward/back = no rotation, strafe = max rate, diagonal = half
rate), called unconditionally after the frozen/locked/shop/emotion gate
in _process(). Godot's yaw-increase handedness is opposite the
reference's D3D Roll(), so the sign is flipped as a platform adaptation;
verified by convergence invariants in keyboard_motion_timeline_test.gd
rather than bit-for-bit angle matching.
Closes movement.keyboard.motion/camera-auto-follow-rotation.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
