* refactor(plugin-sdk): add createPersistentDedupeCache and migrate channel presence caches * refactor(matrix): adopt SDK approval reaction target store * refactor(plugin-sdk): share doctor legacy-state migration fs helpers * refactor(memory-core): dedupe qmd cache entry envelope validation * chore(plugin-sdk): pin surface budgets for shared dedupe and doctor helpers * test(matrix): use future approval expiry fixtures for reaction targets * test(matrix): use future approval expiry fixtures for reaction targets
Move Device Pair notify subscribers and delivery dedupe state into SQLite-backed plugin state. Add doctor migration for legacy notify subscribers; request-id delivery state is cache-only and rebuilt.
