docs(clients/AGENTS): document allowsNonContiguousLayout exception for streaming text views#26457
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Address Devin on #26317. PR #26317 set allowsNonContiguousLayout = false on VSelectableTextView (streaming chat text) because the separate measurement stack races with non-contiguous layout updates. clients/AGENTS.md mandated allowsNonContiguousLayout = true as a blanket rule in two places, which would re-introduce the gap/overlap bug if a future contributor naively followed the rule. Document the exception in both spots, with a pointer to the rationale in SelectableTextView.swift. Codex asked to revert the code change — discarded as it would undo the fix.