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ed76f8f065
The write-time mirror did not eliminate the leak in field testing. Re-add the DIAG diagnostics around the exit-node selection flow to capture a fresh trace: - UpdateRoutes: incoming client networks, selector state before/after the management update, and the networks remaining after FilterSelectedExitNodes. - mirrorV6ExitPairSelections: the NetIDs present in this update and the v6 pairs V6ExitMergeSet derives from them (reveals whether the v4 base and its ::/0 pair are present in the same update so the pair can be matched). - SyncPairedSelection: the base/paired state before and after the sync. - FilterSelectedExitNodes / applyExitNodeFilter: per-route SKIP/KEEP/DROP and the selection lookups behind each decision. - updateExitNodeSelections / logExitNodeUpdate: categorization and deselect set. Temporary; to be removed once the root cause is confirmed.