Gain stays the one detection rule: both branches are scaled by the fraction
of the signal that survives the clouds between observer and target
(Zone.Obscuration, exactly 1f with none, so the pre-cloud trace is
bit-identical). The entity loop passes it for pings and passive ticks and
PassiveRate for the chunk position. Entity.cs is untouched: a lock falls by
the existing detection-threshold rule when info does. Adds the sensor-level
facts to VapourCloudTests. Builds; not yet run (verify job follows).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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