B.5.2.0:16 - Boundary crossing and invalid drift

A prompt should enter B.5.2 only when the question is explicit enough that rival hypotheses can now be compared against it. If the question is still underspecified, the admissible continuation is further stabilization or routing, not premature abduction.

A routed cue may be close to prompt form but still missing one decisive contrast or witness. In such cases the candidate stays outside U.AbductivePrompt until its initiating question is stable.

A bare intuition, slogan, or rhetorical question with no prompt species and no cue provenance is not yet an admissible U.AbductivePrompt.

A common failure mode is drift from cue -> prompt -> hypothesis without anyone naming the boundary crossings. B.5.2.0 blocks that drift by keeping the prompt package distinct from both the earlier cue pack and the downstream prime hypothesis.