E.17.EFP:5.5 - Class-specific reopen cues in the worked slices

• SourcePinnedExplanation reopens when the pinned source claim set, source pins, or face-use assumptions change so that the rendering can no longer remain claim-preserving and visibly source-bound.
• SourceLinkedExplanationReconstruction reopens when any source premise, effective-scheme rule, derivation, context identity, source claim about the exact relation occurrence, or that occurrence’s obtaining basis changes or disappears.
• DidacticRetelling reopens when the exact source or target edition connected under A.6.3 changes, or when teaching use starts functioning as policy-bearing, design-bearing, or gate-bearing guidance.
• SpeculativeRetelling reopens when its exact B.5.2 hypothesis edition, prompt link, or exploratory use changes; it never falls back to being a passive form of the observation source.