ActionGameManager.Sensitivity was a Unity-serialized public float2, but
CultMath's float2 isn't Unity-serializable, so ARPG.unity's stored value
loaded as zero and mouse look went dead. Sensitivity is a player
preference, so it belongs in PlayerInputSettings (key 2) with the prior
default (-0.001, 0.001) as a field initializer, so a pre-existing player
store missing the key still deserializes to the working default instead
of zero. ActionGameManager now reads PlayerSettings.InputSettings.Sensitivity
directly; no cached copy on the MonoBehaviour. Adds a pinning test that
simulates an old store lacking key 2 and asserts the default, plus a
round-trip test for a non-default value.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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