C.19:0 - Use this when

• several candidate lines, family regions, or frontier segments remain live under one declared exploration and exploitation policy and the question is now policy over that pool rather than one more local choice result
• the next result should say whether to widen, keep the frontier, narrow to a subset, or sunset a line
• if the question is no longer pool policy, the C.19 use closes by naming the next subject pattern and the reason that pattern now applies
• the governing lens or policy state must be explicit rather than inferred from vague exploration language

If a proposed pool-policy premise is expressed as learning progress, information gain, novelty, or an articulated former cue, recover its exact result owner first. Use E.10.LRN only while learning wording hides that result, A.10 only when an evidence-bearing or source-bearing claim is actually relied on, C.17 or C.18 only when characterization or possibility-space change is current, C.11.CRC only when a finite configuration-relative comparison is missing, and C.11 for local option or probe choice. Stop before C.19 unless the remaining question is policy over a still-live pool.