SurfaceFlaws

A flawed source's two angles, and the tilt that cancels the flaw

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Test	What it does	Result
test_analyses_apart	The two four-tuples are not slot-aligned: the fourth of tolerant is a phase error rate and the fourth of standard is a coin imbalance, whose GLLP bound sits above the exact value.	✅ pass
test_decoy_seam	coin() is the only entry point taking a supplied y1; the two rate methods build their own and expose no seam a decoy bound could enter.	✅ pass
test_engine_match	Every method reaches its engine entry point with the two angles in the engine's own argument order.	✅ pass
test_flaw_shipped	q.SourceFlaw is in __all__ and present on the package.	✅ pass
test_flaws_cancel	At tilt = 0 the phase error does not move with the flaw at all, and at tilt = -delta it is sin^2(delta/2).	✅ pass
test_tilt_signed	The published configuration is a SIGNED tilt = -delta, while the only angle a q.Link receiver carries is an unsigned misalignment refused below zero.	✅ pass
test_tilt_stated	Neither angle defaults, so the configuration in which Bob's modulator cancels Alice's cannot be fallen into by leaving a field out; opposed() is tilt = -delta.	✅ pass