DecoyGuards

Intensity-ordering and range guards on the decoy interface

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Test	What it does	Result
test_reject_bad_channel	The channel helpers guard their own ranges: transmittance, background, length.	✅ pass
test_reject_intensities	The intensity triple is rejected wherever Eq. (15) fails or a value leaves its range and the message names the slot, as are gains and error rates outside [0, 1].	✅ pass
test_vacuous_bound	Statistics too poor to prove anything give Y1 = Q1 = 0 and e1 capped at 1/2, past which 1 - H2(e1) rises again.	✅ pass